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@c -*- coding: utf-8; mode: texinfo; -*-
@c \version "2.17.29"
@node Alapfogalmak
@chapter Alapfogalmak
@translationof Fundamental concepts
@translationof Fundamental concepts

Miután megtanultuk, hogyan állíthatunk elő gyönyörű kottákat egyszerű szöveges
fájlokból, ebben a szakaszban megismerjük azokat a fogalmakat és technikákat,
amelyek segítségével hasonlóan gyönyörű, de bonyolultabb kottákat készíthetünk.

@menu
* Hogyan működnek a LilyPond bemeneti fájlok?::
* A szólamok zenét tartalmaznak::
* Kontextusok és ábrázolók::
* A sablonok kibővítése::
@end menu

@node Hogyan működnek a LilyPond bemeneti fájlok?
@section Hogyan működnek a LilyPond bemeneti fájlok?
@translationof How LilyPond input files work
@translationof How LilyPond input files work

A LilyPond bemeneti formátuma meglehetősen rugalmas, így a tapasztalt
felhasználóknak nagy szabadságot ad abban, hogyan strukturálják a
forrásfájljaikat. Azonban ez a rugalmasság az újdonsült felhasználók számára
bonyolult lehet. Ez a szakasz elmagyarázza a struktúra nagy részét, az
egyszerűség kedvéért bizonyos részleteket elnagyolva. A bemeneti formátum
felépítésének teljes leírása a @ruser{File structure} c. szakaszban olvasható.

@menu
* Bevezetés a LilyPond fájlok szerkezetébe::
* A kotta egy összetett zenei kifejezés::
* Zenei kifejezések egymásba ágyazása::
* A gerendák és ívek átfedhetik egymást::
@end menu

@node Bevezetés a LilyPond fájlok szerkezetébe
@subsection Bevezetés a LilyPond fájlok szerkezetébe
@translationof Introduction to the LilyPond file structure
@translationof Introduction to the LilyPond file structure

@c index bemeneti formátum
@c index fájlstruktúra

A LilyPond bemeneti fájlok szerkezetére egy tipikus példa:

@example
\version @w{"@version{}"}

\header @{ @}

\score @{
  @var{...összetett zenei kifejezés...}  % ide jön a zene!
  \layout @{ @}
  \midi @{ @}
@}
@end example

@noindent
Ennek az alapvető mintának sok változata lehetséges, de ez a példa jó
kiindulási alapot jelent.

@funindex \book
@funindex book
@funindex \score
@funindex score
@cindex book
@cindex score

Eddig egyik példa sem használta a @code{\score@{@}} parancsot. Ennek oka, hogy
a LilyPond automatikusan hozzáadja az egyszerű bemenethez a szükséges
parancsokat. A következő bemenet például:

@example
\relative c'' @{
  c4 a d c
@}
@end example

@noindent
a következő rövidítése:

@example
\book @{
  \score @{
    \new Staff @{
      \new Voice @{
        \relative c'' @{
          c4 a b c
        @}
      @}
    @}
    \layout @{ @}
  @}
@}
@end example

Más szóval, ha a bemenet egyetlen zenei kifejezést tartalmaz, a LilyPond úgy
értelmezi a fájlt, mintha a zenei kifejezés körül már szerepelnének a fenti
parancsok.

@cindex implicit kontextusok

@strong{Figyelem!} A dokumentációban sok példa nem tartalmazza a
@code{\new Staff} és @code{\new Voice} parancsokat, így azok implicite kerülnek
létrehozásra. Ez egyszerű példáknál jól működik, de bonyolultabb esetekben,
főleg, ha más parancsokat is használunk, a kontextusok implicit létrehozása
meglepő kimenetet eredményezhet, például nemkívánatos kottasorok jelenlétét.
A kontextusok explicit megadásának módja a @ref{Kontextusok és ábrázolók} c.
részben olvasható.

@warning{Többszólamú zeneművek esetén ajánlott explicit módon létrehozni a
kottasorokat és az azon belüli szólamokat.}

Egyelőre térjünk vissza az első példánkhoz, és vizsgáljuk meg csak a
@code{\score} parancsot.

A @code{\score} blokkon belül először pontosan egy zenei kifejezésnek kell
következnie.
Emlékezzünk arra, hogy egy zenei kifejezés lehet egy hang is, de akár
egy olyan nagy összetett kifejezés is, mint:

@example
@{
  \new StaffGroup <<
    @var{...egy teljes Wagner-opera zenei anyaga...}
  >>
@}
@end example

@noindent
Mivel mindez egy @code{@{ ... @}} blokkban szerepel, egy zenei
kifejezésnek számít.

Ahogy korábban láttuk, a @code{\score} blokk a zenén kívül más definíciókat is
tartalmazhat, mint például:

@example
\score @{
  @{ c'4 a b c' @}
  \header @{ @}
  \layout @{ @}
  \midi @{ @}
@}
@end example

@funindex \header
@funindex header
@funindex \layout
@funindex layout
@funindex \midi
@funindex midi
@cindex header
@cindex layout
@cindex midi

@noindent
Ez a három parancs -- @code{\header}, @code{\layout} és @code{\midi} --
speciális: az eddigi parancsokkal ellentétben @emph{nem} zenei kifejezések, és
nem azok részei. A @code{\score} blokkon belül vagy kívül is elhelyezkedhetnek
-- például a @code{\header} (fejléc) blokk, melyben a kotta adatait (pl. cím,
szerző stb.) lehet megadni, legtöbbször a @code{\score} parancs előtt szerepel,
ahogy a szakasz elején található példában is látható.

A két további, még ismeretlen parancs: @code{\layout @{@}} és
@code{\midi @{@}}. Ezek ebben a formában rendre azt jelentik, hogy a LilyPond
kottaképet, ill. hangzó anyagot állítson elő. Teljes leírásuk a Kottaírás
Kézikönyvében található, a @ruser{Score layout} és a
@ruser{Creating MIDI files} szakaszokban.

@cindex több kotta
@cindex implicit book blokk
@funindex \book
@funindex book

Egy fájlban több @code{\score} blokk lehet. Mindegyik egy-egy zeneművet
vagy tételt jelöl, de ezek egy kimeneti fájlban fognak megjelenni. Nem
szükséges @code{\book} blokkba foglalni őket -- ez implicite megtörténik.
Ha azonban több kimeneti fájlt szeretnénk kapni egy forrásfájlból, akkor több
@code{\book} blokkot kell megadnunk -- kimeneti fájlonként egyet-egyet.

Összegezve:

Minden @code{\book} blokk külön kimeneti fájlt eredményez (pl. egy-egy PDF
állományt). Ha nem szerepel explicit módon a forráskódban, akkor a LilyPond
körülveszi az egész forráskódot egy @code{\book} blokkal.

Egy @code{\book} blokkon belül minden @code{\score} blokk különálló zenei
egységet jelöl.

@cindex layout blokk helye

Minden @code{\layout} blokk arra a @code{\score} vagy @code{\book} blokkra
érvényes, amelyben szerepel -- tehát egy @code{\score} blokkon belüli
@code{\layout} blokk csakis arra az egy @code{\score} blokkra vonatkozik,
de egy @code{\score} blokkon kívüli @code{\layout} blokk a @code{\score}
blokkot tartalmazó (akár explicit, akár implicit) @code{\book} blokkon belüli
minden @code{\score} blokkra érvényes.

A részletek a @ruser{Multiple scores in a book} c. részben olvashatók.

@cindex változók

Fájljainkat áttekinthetőbbé tehetjük változók definiálásával (ld.
@ref{Művek szervezettebbé tétele változók segítségével}). Minden sablonban ezt
a módszert használjuk:

@example
dallam = \relative c' @{
  c4 a b c
@}

\score @{
  \dallam
@}
@end example

Amikor a LilyPond feldolgozza ezt a fájlt, a @code{dallam} változó értékét
(azaz mindent az egyenlőségjel utáni zenei kifejezésből) beszúrja mindenhova,
ahol @code{\dallam} hivatkozást lát. A változók nevére nincs sok megkötés -- a
következők mind helyes példák:  @code{dallam}, @code{jobbkéz}, @code{fuvola},
@code{BII} stb. A @ref{Kevesebb gépelés változókkal és függvényekkel} c.
szakasz további információkat tartalmaz. Mindössze annyi a korlátozás, hogy a
változónevek csak betűket tartalmazhatnak, és nem ütközhetnek a
LilyPond parancsok neveivel. A pontos szabályok a @ruser{File structure} c.
részben vannak leírva.

@seealso
A bemeneti formátum teljes definíciója a
@ruser{File structure} c. szakaszban található.

@node A kotta egy összetett zenei kifejezés
@subsection A kotta egy összetett zenei kifejezés
@translationof Score is a (single) compound musical expression
@translationof Score is a (single) compound musical expression

@funindex \score
@funindex score
@cindex score
@cindex összetett zenei kifejezés

Az előző szakaszban (@ref{Bevezetés a LilyPond fájlok szerkezetébe}) már láttuk
a LilyPond fájlok általános felépítését. De a legfontosabb részt mintha
átugrottuk volna: mi kerüljön a @code{\score} blokk belsejébe?

Valójában ez sokkal egyszerűbb, mint gondolnánk. Ez a mondat mindent
megmagyaráz:

@quotation
@emph{A @code{\score} blokknak egy összetett zenei kifejezéssel kell
kezdődnie.}
@end quotation

@noindent
Az összetett zenei kifejezés fogalmát már tisztáztuk
@ref{A zenei kifejezés fogalma} c. részben. Láttuk, hogy építhetünk fel nagy
zenei kifejezéseket kis részekből -- először hangokból, aztán akkordokból stb.
Most egy összetett zenei kifejezést vizsgálunk meg felülről lefelé. Az
egyszerűség kedvéért egy zongorakíséretes dal lesz a példánk. Először is
szükségünk van az énekes és a zongorista szólamára.

@example
\score @{
  <<
    \new Staff = "ének" <<
    >>
    \new PianoStaff = "zongora" <<
    >>
  >>
  \layout @{ @}
@}
@end example

Elneveztük a két szólamot @qq{ének} és @qq{zongora} néven. Ez nem kötelező,
de jó szokás, hogy első pillantásra lássuk, melyik szólam mire szolgál.

Emlékezzünk arra, hogy @code{<< ... >>} szolgál több szólam jelölésére. Ennek
hatására az ének- és a zongoraszólam egymás alatt fog megjelenni a kottában.
A zongoraszólam két kottasort fog tartalmazni, az énekszólam pedig egy
kottasort és egy dalszöveget, így mindkettőhöz @code{<< ... >>} blokk kell.
A dalszöveghez az @code{\addlyrics} parancsot fogjuk használni. Ha szükséges
feleleveníteni, az @ref{Egyszerű dalok kottázása} c. részben olvashatunk róla.

@lilypond[verbatim,quote,ragged-right]
\score {
  <<
    \new Staff = "ének" <<
      \new Voice = "dallam" { c'1 }
      \addlyrics { Szólt }
    >>
    \new PianoStaff = "zongora" <<
      \new Staff = "jobbkéz" { c'1 }
      \new Staff = "balkéz" { c'1 }
    >>
  >>
  \layout { }
}
@end lilypond

Most megvan a teljes struktúra. Az énekszólam egy @code{Voice} kontextust
tartalmaz a hangoknak, és egy strófányi dalszöveget. A zongoraszólam pedig
a jobb- és balkéz kottasorait tartalmazza.

Most elkezdhetjük kitölteni a hangokat. Elkezdhetnénk közvetlenül a Voice
kontextus belsejébe beleírni, hogy:

@example
\relative c'' @{
  r4 d8\noBeam g, c4 r
@}
@end example

De ha ezt tennénk, a @code{\score} blokk nagyon bonyolult lenne, és nem lehetne
átlátni a szólamok szerkezetét. Így érdemes változókat használni. A dalszöveg
változóként való megadására a @code{\lyricmode} parancsot kell használni, hogy
a LilyPond dalszövegként és ne hangokként értelmezze a változó tartalmát.
(A dalszöveg egy külön beviteli mód, ezekből még több is van, ld. az
@ruser{Input modes} c. részt.)

Tehát miután definiáltuk a megfelelő változókat, hivatkoztunk rájuk, és
basszuskulccsal láttuk el a balkezet, kész egy valódi mű kezdete:

@lilypond[verbatim,quote,ragged-right]
dallam = \relative c'' { r4 d8\noBeam g, c4 r }
dalszöveg = \lyricmode { Szólt az Úr, }
jobbkéz = \relative c'' { <g d g,>2~ <g d g,> }
balkéz = \relative c { b2 e2 }

\score {
  <<
    \new Staff = "ének" <<
      \new Voice = "dallam" { \dallam }
      \addlyrics { \dalszöveg }
    >>
    \new PianoStaff = "zongora" <<
      \new Staff = "jobbkéz" { \jobbkéz }
      \new Staff = "balkéz" {
        \clef "bass"
        \balkéz
      }
    >>
  >>
  \layout { }
}
@end lilypond

Amikor a @code{\score} blokkot írjuk vagy olvassuk, mindig lassan, gondosan
járjunk el. Haladjunk kívülről befelé, a magas szintű felépítéstől a részletek
felé haladva. Nagyban segít, ha ügyelünk a behúzásokra -- minden blokk
kezdődjön egy tabulátorral beljebb, így az egy szinten levő blokkok ugyanolyan
mértékben lesznek behúzva.

@seealso
Referencia: @ruser{Structure of a score}.


@node Zenei kifejezések egymásba ágyazása
@subsection Zenei kifejezések egymásba ágyazása
@translationof Nesting music expressions

@cindex ideiglenes kottasorok
@cindex ossia

Ossiák bevitelekor jön jól, hogy kottasorok bármikor, darab közben is
kezdődhetnek, és bármikor végződhetnek. Álljon itt erre egy példa:

@lilypond[verbatim,quote,ragged-right]
\new Staff {
  \relative g' {
    r4 g8 g c4 c8 d |
    e4 r8
    <<
      { f c c }
      \new Staff {
        f8 f c
      }
    >>
    r4 |
  }
}
@end lilypond

@noindent
Figyeljük meg, hogy a kulcs mérete némileg kisebb, mint a sor elején szereplő
kulcsé (mint ahogy kulcsváltásnál is).

@cindex kottasorok pozíciója

Az ossia a kottasor fölött is elhelyezkedhet:

@lilypond[verbatim,quote,ragged-right]
\new Staff = "main" {
  \relative g' {
    r4 g8 g c4 c8 d |
    e4 r8
    <<
      { f c c }
      \new Staff \with {
        alignAboveContext = #"main" }
      { f8 f c }
    >>
    r4 |
  }
}
@end lilypond

Ebben a példában a még ismeretlen @code{\with} parancsot használtuk, amelyet
később ismertetünk. Most elég annyit tudni róla, hogy a kottasor bizonyos
tulajdonságainak módosítására szolgál. Itt egy olyan tulajdonságot adunk meg,
ami azt mondja, hogy az új kottasor a @qq{main} nevű kottasor felett
helyezkedjen el (ahelyett, hogy alatta helyezkedne el, ami az alapértelmezés).


@seealso
Az ossiákat általában kulcs és ütemmutató nélkül, valamint kisebb méretben
szedjük. Ehhez további új parancsok kellenek; ld. az @ref{Size of objects} és
@ruser{Ossia staves} szakaszokat.


@node A gerendák és ívek átfedhetik egymást
@subsection A gerendák és ívek átfedhetik egymást
@translationof On the un-nestedness of brackets and ties

@cindex zárójeltípusok
@cindex zárójelek egymásba ágyazása

Már sok zárójelfajtával találkoztunk a LilyPond fájlok írása közben. Ezekre
különböző szabályok vonatkoznak, amelyeket érdemes tisztázni. Ismételjük át
ezeket a típusokat.

@need 50
@multitable @columnfractions .3 .7
@headitem Zárójelfajta
  @tab Szerep
@item @code{@{ .. @}}
  @tab Egymás után megszólaló hangokat tartalmaz
@item @code{< .. >}
  @tab Egy akkord hangjait tartalmazza
@item @code{<< .. >>}
  @tab Egyszerre megszólaló zenei kifejezéseket tartalmaz
@item @code{( .. )}
  @tab Egy ív kezdetét és végét jelöli
@item @code{\( .. \)}
  @tab Egy frazeálóív kezdetét és végét jelöli
@item @code{[ .. ]}
  @tab Egy kézi gerenda kezdetét és végét jelöli
@end multitable

A LilyPond világán kívül a különböző fajtájú zárójeleket megfelelően egymásba
kell ágyazni, pl. így: @code{<< [ @{ ( .. ) @} ] >>}. Tehát a záró
zárójeleknek pontosan fordított sorrendben kell állniuk, mint a nyitó
zárójeleknek. A fenti táblázatban szereplő első három típusnál (a blokkoknál)
ezt a LilyPond is megköveteli. A többi parancsnál ez nem követelmény.
Valójában ezekre nem is úgy érdemes gondolni, mint a zárójelekre, hanem olyan
jelzésekre, amelyek zenei elemek kezdetét és végét jelölik.

Tehát például egy frazeálóív kezdődhet egy kézzel megadott gerenda előtt, és
befejeződhet a gerenda vége előtt -- lehet, hogy nem a legzeneibb megoldás, de
lehetséges:

@lilypond[quote,verbatim,fragment,ragged-right,relative=2]
 { g8\( a b[ c b\) a] }
@end lilypond

Általánosságban az ívek, frazeálóívek, kötőívek és gerendák átnyúlhatnak
a triolák és előkék határain. A következő példában az 1. sorban egy gerenda,
a 2. sorban egy kötőív nyúl bele egy triolába, a 3. és 4. sorban pedig
mindezek mellett még egy kötőív is található két triola között, valamint egy
frazeálóív, amely túlnyúlik a triolán.

@lilypond[quote,verbatim,fragment,ragged-right]
{
  r16[ g16 \tuplet 3/2 {r16 e'8] }
  g16( a \tuplet 3/2 {b d) e' }
  g8[( a \tuplet 3/2 {b d') e'~]}
  \tuplet 5/4 {e'32\( a b d' e'} a'4.\)
}
@end lilypond


@node A szólamok zenét tartalmaznak
@section A szólamok zenét tartalmaznak
@translationof Voices contain music


Singers need voices to sing, and so does LilyPond.
The actual music for all instruments in a score
is contained in Voices -- the most fundamental
of all LilyPond's concepts.

@menu
* Hangzatos szólamok::
* Szólamok kézi létrehozása::
* Szólamok és vokális zene::
@end menu

@node Hangzatos szólamok
@subsection Hangzatos szólamok
@translationof I'm hearing Voices


@cindex polyphony
@cindex layers
@cindex multiple voices
@cindex voices, multiple
@cindex Voice context
@cindex context, Voice
@cindex simultaneous music
@cindex music, simultaneous
@cindex concurrent music
@cindex music, concurrent
@cindex voices vs. chords
@cindex chords vs. voices

The lowest, most fundamental or innermost layers in a LilyPond
score are called @q{Voice contexts} or just @q{Voices} for short.
Voices are sometimes called @q{layers} in other notation
packages.

In fact, a Voice layer or context is the only one which can contain
music.  If a Voice context is not explicitly declared one is created
automatically, as we saw at the beginning of this chapter.  Some
instruments such as an Oboe can play only one note at a time.  Music
written for such instruments is monophonic and requires just a single
voice.  Instruments which can play more than one note at a time like
the piano will often require multiple voices to encode the different
concurrent notes and rhythms they are capable of playing.

A single voice can contain many notes in a chord, of course,
so when exactly are multiple voices needed?  Look first at
this example of four chords:

@lilypond[quote,verbatim,fragment,ragged-right,relative=1]
\key g \major
<d g>4 <d fis> <d a'> <d g>
@end lilypond

This can be expressed using just the single angle bracket chord
symbols, @code{< ... >}, and for this just a single voice is
needed.  But suppose the F-sharp were actually an eighth-note
followed by an eighth-note G, a passing note on the way to the A?
Now we have two notes which start at the same time but have
different durations: the quarter-note D and the eighth-note
F-sharp.  How are these to be coded?  They cannot be written as
a chord because all the notes in a chord must have the same
duration.  And they cannot be written as two sequential notes
as they need to start at the same time.  This is when two
voices are required.

Let us see how this is done in LilyPond input syntax.

@funindex << \\ >>
@funindex \\

The easiest way to enter fragments with more than one voice on a
staff is to enter each voice as a sequence (with @code{@{...@}}),
and combine them simultaneously with angle brackets, @code{<<...>>}.
The fragments must also be separated with double backward slashes,
@code{\\}, to place them in separate voices.  Without these, the
notes would be entered into a single voice, which would usually
cause errors.  This technique is particularly suited to pieces of
music which are largely monophonic with occasional short sections
of polyphony.

Here's how we split the chords above into two voices and add both
the passing note and a slur:

@lilypond[quote,verbatim,fragment,ragged-right,relative=2]
\key g \major
%    Voice "1"                  Voice "2"
<< { g4 fis8( g) a4 g }  \\  { d4 d d d }  >>
@end lilypond

Notice how the stems of the second voice now point down.

Here's another simple example:

@lilypond[quote,verbatim,fragment,ragged-right,relative=2]
\key d \minor
%    Voice "1"             Voice "2"
<< { r4 g g4. a8 }    \\ { d,2 d4 g }       >>
<< { bes4 bes c bes } \\ { g4 g g8( a) g4 } >>
<< { a2. r4 }         \\ { fis2. s4 }       >>
@end lilypond

It is not necessary to use a separate @code{<< \\ >>} construct
for each bar. For music with few notes in each bar this layout
can help the legibility of the code, but if there are many
notes in each bar it may be better to split out each voice
separately, like this:

@lilypond[quote,verbatim,fragment,ragged-right,relative=2]
\key d \minor
<< {
  % Voice "1"
  r4 g g4. a8 |
  bes4 bes c bes |
  a2. r4 |
} \\ {
  % Voice "2"
  d,2 d4 g |
  g4 g g8( a) g4 |
  fis2. s4 |
} >>
@end lilypond


@cindex voices, naming
@cindex voices crossing brackets
@cindex slurs crossing brackets
@cindex ties crossing brackest

This example has just two voices, but the same construct may be
used to encode three or more voices by adding more back-slash
separators.

The Voice contexts bear the names @code{"1"}, @code{"2"}, etc.
In each of these contexts, the vertical direction of slurs,
stems, ties, dynamics etc., is set appropriately.

@lilypond[quote,verbatim,fragment]
\new Staff \relative c' {
  % Main voice
  c16 d e f
  %    Voice "1"     Voice "2"                 Voice "3"
  << { g4 f e } \\ { r8 e4 d c8~ } >>
  << { d2 e2 }  \\ { c8 b16 a b8 g~ g2 } \\ { s4 b4 c2 } >>
}
@end lilypond

These voices are all separate from the main voice that contains
the notes just outside the @code{<< .. >>} construct.  Let's call
this the @emph{simultaneous construct}.  Slurs and ties may only
connect notes within the same voice, so slurs and ties cannot go
into or out of a simultaneous construct.  Conversely,
parallel voices from separate simultaneous constructs on the same
staff are the same voice.  Other voice-related properties also
carry across simultaneous constructs.  Here is the same example,
with different colors and note heads for each voice.  Note that
changes in one voice do not affect other voices, but they do
persist in the same voice later.  Note also that tied notes may be
split across the same voices in two constructs, shown here in the
blue triangle voice.

@lilypond[quote,verbatim]
\new Staff \relative c' {
  % Main voice
  c16 d e f
  <<  % Bar 1
    {
      \voiceOneStyle
      g4 f e
    }
  \\
    {
      \voiceTwoStyle
      r8 e4 d c8~
    }
  >>
  <<  % Bar 2
     % Voice 1 continues
    { d2 e2 }
  \\
     % Voice 2 continues
    { c8 b16 a b8 g ~ g2 }
  \\
    {
      \voiceThreeStyle
      s4 b4 c2
    }
  >>
}
@end lilypond

@funindex \voiceOneStyle
@funindex \voiceTwoStyle
@funindex \voiceThreeStyle
@funindex \voiceFourStyle
@funindex \voiceNeutralStyle

The commands @code{\voiceXXXStyle} are mainly intended for use in
educational documents such as this one.  They modify the color
of the note head, the stem and the beams, and the style of the
note head, so that the voices may be easily distinguished.
Voice one is set to red diamonds, voice two to blue triangles,
voice three to green crossed circles, and voice four (not used
here) to magenta crosses;  @code{\voiceNeutralStyle} (also not
used here) reverts the style back to the default.
We shall see later how commands like these may be created by the
user.
See @ref{Visibility and color of objects} and
@ref{Using variables for tweaks}.

@cindex polyphony and relative note entry
@cindex relative note entry and polyphony

Polyphony does not change the relationship of notes within a
@code{\relative @{ @}} block.  Each note is still calculated
relative to the note immediately preceding it, or to the first
note of the preceding chord.  So in

@example
\relative c' @{ noteA << < noteB noteC > \\ noteD >> noteE @}
@end example

@noindent
@code{noteB} is relative to @code{noteA}                      @*
@code{noteC} is relative to @code{noteB}, not @code{noteA};   @*
@code{noteD} is relative to @code{noteB}, not @code{noteA} or
@code{noteC};                                                 @*
@code{noteE} is relative to @code{noteD}, not @code{noteA}.

An alternative way, which may be clearer if the notes in the
voices are widely separated, is to place a @code{\relative}
command at the start of each voice:

@example
\relative c' @{ noteA ... @}
<<
  \relative c'' @{ < noteB noteC > ... @}
\\
  \relative g' @{ noteD ... @}
>>
\relative c' @{ noteE ... @}
@end example

Let us finally analyze the voices in a more complex piece of music.
Here are the notes from the first two bars of the second of Chopin's
Deux Nocturnes, Op 32.  This example will be used at later stages in
this and the next chapter to illustrate several techniques for
producing notation, so please ignore for now anything in the
underlying code which looks mysterious and concentrate just on the
music and the voices -- the complications will all be explained in
later sections.

@c The following should appear as music without code
@lilypond[quote,ragged-right]
\new Staff \relative c'' {
  \key aes \major
  <<  % Voice one
    { c2 aes4. bes8 }
  \\  % Voice two
    { aes2 f4 fes }
  \\  % No voice three
  \\  % Voice four
    {
      % Ignore these for now - they are explained in Ch 4
      \once \override NoteColumn.force-hshift = #0
      <ees c>2
      \once \override NoteColumn.force-hshift = #0.5
      des2
    }
  >> |
  <c ees aes c>1 |
}
@end lilypond

The direction of the stems is often used to indicate the continuity of
two simultaneous melodic lines.  Here the stems of the highest notes
are all pointing up and the stems of the lower notes are all pointing
down.  This is the first indication that more than one voice is
required.

But the real need for multiple voices arises when notes
which start at the same time have different durations.
Look at the notes which start at beat three in the first
bar.  The A-flat is a dotted quarter note, the F is a
quarter note and the D-flat is a half note.  These
cannot be written as a chord as all the notes in a chord
must have the same duration.  Neither can they be written
as sequential notes, as they must start at the same time.
This section of the bar requires three voices, and the
normal practice would be to write the whole bar as three
voices, as shown below, where we have used different note heads
and colors for the three voices.  Again, the code behind this
example will be explained later, so ignore anything you do
not understand.

@c The following should appear as music without code
@c The three voice styles should be defined in -init
@lilypond[quote,ragged-right]
\new Staff \relative c'' {
  \key aes \major
  <<
    {  % Voice one
      \voiceOneStyle
      c2 aes4. bes8
    }
  \\  % Voice two
    { \voiceTwoStyle
      aes2 f4 fes
    }
  \\  % No Voice three (we want stems down)
  \\  % Voice four
    { \voiceThreeStyle
      % Ignore these for now - they are explained in Ch 4
      \once \override NoteColumn.force-hshift = #0
      <ees c>2
      \once \override NoteColumn.force-hshift = #0.5
      des2
    }
  >>
  <c ees aes c>1
}
@end lilypond


Let us try to encode this music from scratch.  As we
shall see, this encounters some difficulties.  We begin as
we have learnt, using the @code{<< \\  >>} construct to
enter the music of the first bar in three voices:

@lilypond[quote,verbatim,fragment,ragged-right]
\new Staff \relative c'' {
  \key aes \major
  <<
    { c2 aes4. bes8 } \\ { aes2 f4 fes } \\ { <ees c>2 des2 }
  >>
  <c ees aes c>1
}
@end lilypond

@cindex stem down
@cindex voices and stem directions
@cindex stem directions and voices
@cindex stem up

The stem directions are automatically assigned with the
odd-numbered voices taking upward stems and the even-numbered
voices downward ones.  The stems for voices 1 and 2 are right,
but the stems in voice 3 should go down in this particular piece
of music.  We can correct this by skipping voice three
and placing the music in voice four. This is done by simply
adding another pair of @code{\\}.

@lilypond[quote,verbatim,fragment,ragged-right]
\new Staff \relative c'' {
  \key aes \major
  <<  % Voice one
    { c2 aes4. bes8 }
  \\  % Voice two
    { aes2 f4 fes }
  \\  % Omit Voice three
  \\  % Voice four
    { <ees c>2 des2 }
  >>
  <c ees aes c>1
}
@end lilypond

@noindent
We see that this fixes the stem direction, but exposes a problem
sometimes encountered with multiple voices -- the stems of the notes
in one voice can collide with the note heads in other voices.  In
laying out the notes, LilyPond allows the notes or chords from two
voices to occupy the same vertical note column provided the stems are
in opposite directions, but the notes from the third and fourth voices
are displaced, if necessary, to avoid the note heads colliding.  This
usually works well, but in this example the notes of the lowest voice
are clearly not well placed by default. LilyPond provides several ways
to adjust the horizontal placing of notes.  We are not quite ready yet
to see how to correct this, so we shall leave this problem until a
later section --- see the @code{force-hshift} property in @ref{Fixing
overlapping notation}.


@seealso
Notation Reference: @ruser{Multiple voices}.


@node Szólamok kézi létrehozása
@subsection Szólamok kézi létrehozása
@translationof Explicitly instantiating voices


@funindex \voiceOne
@funindex voiceOne
@funindex \voiceTwo
@funindex voiceTwo
@funindex \voiceThree
@funindex voiceThree
@funindex \voiceFour
@funindex voiceFour
@funindex \oneVoice
@funindex oneVoice
@funindex \new Voice
@cindex voice contexts, creating

Voice contexts can also be created manually
inside a @code{<< >>} block to create polyphonic music, using
@code{\voiceOne} ... @code{\voiceFour} to indicate the required
directions of stems, slurs, etc.  In longer scores this method
is clearer, as it permits the voices to be separated and to be
given more descriptive names.

Specifically, the construct @code{<< \\ >>} which we used in
the previous section:

@example
\new Staff @{
  \relative c' @{
    << @{ e4 f g a @} \\ @{ c,4 d e f @} >>
  @}
@}
@end example

@noindent
is equivalent to

@example
\new Staff <<
  \new Voice = "1" @{ \voiceOne \relative c' @{ e4 f g a @} @}
  \new Voice = "2" @{ \voiceTwo \relative c' @{ c4 d e f @} @}
>>
@end example

Both of the above would produce

@c The following example should not display the code
@lilypond[ragged-right,quote]
\new Staff <<
  \new Voice = "1" { \voiceOne \relative c' { e4 f g a } }
  \new Voice = "2" { \voiceTwo \relative c' { c4 d e f } }
>>
@end lilypond

@cindex voices, reverting to single
@cindex reverting to a single voice

The @code{\voiceXXX} commands set the direction of stems, slurs,
ties, articulations, text annotations, augmentation dots of dotted
notes, and fingerings.  @code{\voiceOne} and @code{\voiceThree}
make these objects point upwards, while @code{\voiceTwo} and
@code{\voiceFour} make them point downwards.  These commands also
generate a horizontal shift for each voice when this is required
to avoid clashes of note heads.  The command @code{\oneVoice}
reverts the settings back to the normal values for a single voice.

Let us see in some simple examples exactly what effect
@code{\oneVoice}, @code{\voiceOne} and @code{voiceTwo} have on
markup, ties, slurs, and dynamics:

@lilypond[quote,ragged-right,verbatim]
\relative c'{
  % Default behavior or behavior after \oneVoice
  c d8~ d e4( f g a) b-> c
}
@end lilypond

@lilypond[quote,ragged-right,verbatim]
\relative c'{
  \voiceOne
  c d8~ d e4( f g a) b-> c
  \oneVoice
  c, d8~ d e4( f g a) b-> c
}
@end lilypond

@lilypond[quote,ragged-right,verbatim]
\relative c'{
  \voiceTwo
  c d8~ d e4( f g a) b-> c
  \oneVoice
  c, d8~ d e4( f g a) b-> c
}
@end lilypond

Now let's look at three different ways to notate the same passage
of polyphonic music, each of which is advantageous in different
circumstances, using the example from the previous section.

An expression that appears directly inside a @code{<< >>} belongs
to the main voice (but, note, @strong{not} in a @code{<< \\ >>}
construct).  This is useful when extra voices appear while the
main voice is playing.  Here is a more correct rendition of our
example.  The red diamond-shaped notes
demonstrate that the main melody is now in a single voice context,
permitting a phrasing slur to be drawn over them.

@lilypond[quote,ragged-right,verbatim]
\new Staff \relative c' {
  \voiceOneStyle
  % The following notes are monophonic
  c16^( d e f
  % Start simultaneous section of three voices
  <<
    % Continue the main voice in parallel
    { g4 f e | d2 e2) | }
    % Initiate second voice
    \new Voice {
      % Set stems, etc., down
      \voiceTwo
      r8 e4 d c8~ | c8 b16 a b8 g~ g2 |
    }
    % Initiate third voice
    \new Voice {
      % Set stems, etc, up
      \voiceThree
      s2. | s4 b4 c2 |
    }
  >>
}
@end lilypond

@cindex nesting music expressions
@cindex nesting simultaneous constructs
@cindex nesting voices
@cindex voices, temporary
@cindex voices, nesting

More deeply nested polyphony constructs are possible, and if a
voice appears only briefly this might be a more natural way to
typeset the music:

@lilypond[quote,ragged-right,verbatim]
\new Staff \relative c' {
  c16^( d e f
  <<
    { g4 f e | d2 e2) | }
    \new Voice {
      \voiceTwo
      r8 e4 d c8~
      <<
        { c8 b16 a b8 g~ g2 }
        \new Voice {
          \voiceThree
          s4 b4 c2
        }
      >>
    }
  >>
}
@end lilypond

@cindex spacing notes

This method of nesting new voices briefly is useful
when only small sections of the music
are polyphonic, but when the whole staff is largely polyphonic
it can be clearer to use multiple voices throughout, using
spacing notes to step over sections where the voice is silent,
as here:

@lilypond[quote,ragged-right,verbatim]
\new Staff \relative c' <<
  % Initiate first voice
  \new Voice {
    \voiceOne
    c16^( d e f g4 f e | d2 e2) |
  }
  % Initiate second voice
  \new Voice {
    % Set stems, etc, down
    \voiceTwo
    s4 r8 e4 d c8~ | c8 b16 a b8 g~ g2 |
  }
  % Initiate third voice
  \new Voice {
    % Set stems, etc, up
    \voiceThree
    s1 | s4 b4 c2 |
  }
>>
@end lilypond

@subsubheading Note columns

@cindex note column
@cindex note collisions
@cindex collisions, notes
@cindex shift commands
@funindex \shiftOff
@funindex shiftOff
@funindex \shiftOn
@funindex shiftOn
@funindex \shiftOnn
@funindex shiftOnn
@funindex \shiftOnnn
@funindex shiftOnnn

Closely spaced notes in a chord, or notes occurring at the same
time in different voices, are arranged in two, occasionally more,
columns to prevent the note heads overlapping.  These are called
note columns.  There are separate columns for each voice, and
the currently specified voice-dependent shift is applied to the
note column if there would otherwise be a collision.  This can
be seen in the example above.  In bar 2 the C in voice two is
shifted to the right relative to the D in voice one, and in the
final chord the C in voice three is also shifted to the right
relative to the other notes.

The @code{\shiftOn}, @code{\shiftOnn}, @code{\shiftOnnn}, and
@code{\shiftOff} commands specify the degree to which notes and
chords of the voice should be shifted if a collision
would otherwise occur. By default, the outer voices (normally
voices one and two) have @code{\shiftOff} specified, while the
inner voices (three and four) have @code{\shiftOn} specified.
When a shift is applied, voices one and three are shifted to
the right and voices two and four to the left.

@code{\shiftOnn} and @code{\shiftOnnn} define further shift
levels which may be specified temporarily to resolve collisions
in complex situations -- see @ref{Real music example}.

A note column can contain just one note (or chord) from a voice
with stems up and one note (or chord) from a voice with stems
down.  If notes from two voices which have their stems in the
same direction are placed at the same position and both voices
have no shift or the same shift specified, the error message
@qq{Too many clashing note columns} will be produced.


@seealso
Notation Reference: @ruser{Multiple voices}.


@node Szólamok és vokális zene
@subsection Szólamok és vokális zene
@translationof Voices and vocals

Vocal music presents a special difficulty: we need to combine two
expressions -- notes and lyrics.

@funindex \new Lyrics
@funindex \lyricsto
@funindex lyricsto
@funindex Lyrics
@cindex Lyrics context, creating
@cindex lyrics, linking to voice

You have already seen the @code{\addlyrics@{@}} command, which
handles simple scores well.  However, this technique is
quite limited.  For more complex music, you must introduce the
lyrics in a @code{Lyrics} context using @code{\new Lyrics} and
explicitly link
the lyrics to the notes with @code{\lyricsto@{@}}, using the
name assigned to the Voice.

@lilypond[quote,verbatim,fragment]
<<
  \new Voice = "one" \relative c'' {
    \autoBeamOff
    \time 2/4
    c4 b8. a16 g4. f8 e4 d c2
  }
  \new Lyrics \lyricsto "one" {
    No more let sins and sor -- rows grow.
  }
>>
@end lilypond

Note that the lyrics must be linked to a @code{Voice} context,
@emph{not} a @code{Staff} context.  This is a case where it is
necessary to create @code{Staff} and @code{Voice} contexts
explicitly.

@cindex lyrics and beaming
@cindex beaming and lyrics
@funindex \autoBeamOff
@funindex autoBeamOff

The automatic beaming which LilyPond uses by default works well
for instrumental music, but not so well for music with lyrics,
where beaming is either not required at all or is used to indicate
melismata in the lyrics.  In the example above we use the command
@code{\autoBeamOff} to turn off the automatic beaming.

@funindex \new ChoirStaff
@funindex ChoirStaff
@funindex \lyricmode
@funindex lyricmode
@cindex vocal score structure
@cindex choir staff

Let us reuse the earlier example from Judas Maccabæus to
illustrate this more flexible technique.  We first recast
it to use variables so the music and lyrics can be separated
from the staff structure.  We also introduce a ChoirStaff
bracket.  The lyrics themselves must be introduced with
@code{\lyricmode} to ensure they are interpreted as lyrics
rather than music.

@lilypond[quote,verbatim]
global = { \time 6/8 \partial 8 \key f \major}
SopOneMusic = \relative c'' {
  c8 | c([ bes)] a a([ g)] f | f'4. b, | c4.~ c4 | }
SopTwoMusic = \relative c' {
  r8 | r4. r4 c8 | a'([ g)] f f([ e)] d | e([ d)] c bes' | }
SopOneLyrics = \lyricmode {
  Let | flee -- cy flocks the | hills a -- dorn, __ | }
SopTwoLyrics = \lyricmode {
  Let | flee -- cy flocks the | hills a -- dorn, | }

\score {
  \new ChoirStaff <<
    \new Staff <<
      \new Voice = "SopOne" {
        \global
        \SopOneMusic
      }
      \new Lyrics \lyricsto "SopOne" {
        \SopOneLyrics
      }
    >>
    \new Staff <<
      \new Voice = "SopTwo" {
        \global
        \SopTwoMusic
      }
      \new Lyrics \lyricsto "SopTwo" {
        \SopTwoLyrics
      }
    >>
  >>
}
@end lilypond

This is the basic structure of all vocal scores.  More staves may be
added as required, more voices may be added to the staves, more verses
may be added to the lyrics, and the variables containing the music can
easily be placed in separate files should they become too long.

@cindex hymn structure
@cindex SATB structure
@cindex vocal scores with multiple verses
@cindex multiple vocal verses
@cindex verses, multiple vocal

Here is an example of the first line of a hymn with four
verses, set for SATB.  In this case the words for all four
parts are the same.  Note how we use variables to separate the
music notation and words from the staff structure.  See too
how a variable, which we have chosen to call @q{TimeKey}, is used
to hold several commands for use within the two staves.  In other
examples this is often called @q{global}.

@lilypond[quote,verbatim]
TimeKey = { \time 4/4 \partial 4 \key c \major}
SopMusic   = \relative c' { c4 | e4. e8 g4  g  | a a g | }
AltoMusic  = \relative c' { c4 | c4. c8 e4  e  | f f e | }
TenorMusic = \relative c  { e4 | g4. g8 c4. b8 | a8 b c d e4 | }
BassMusic  = \relative c  { c4 | c4. c8 c4  c  | f8 g a b c4 | }
VerseOne   = \lyricmode {
  E -- | ter -- nal fa -- ther, | strong to save, | }
VerseTwo   = \lyricmode {
  O | Christ, whose voice the | wa -- ters heard, | }
VerseThree = \lyricmode {
  O | Ho -- ly Spi -- rit, | who didst brood | }
VerseFour  = \lyricmode {
  O | Tri -- ni -- ty of | love and pow'r | }

\score {
  \new ChoirStaff <<
    \new Staff <<
      \clef "treble"
      \new Voice = "Sop"  { \voiceOne \TimeKey \SopMusic }
      \new Voice = "Alto" { \voiceTwo \AltoMusic }
      \new Lyrics \lyricsto "Sop" { \VerseOne   }
      \new Lyrics \lyricsto "Sop" { \VerseTwo   }
      \new Lyrics \lyricsto "Sop" { \VerseThree }
      \new Lyrics \lyricsto "Sop" { \VerseFour  }
    >>
    \new Staff <<
      \clef "bass"
      \new Voice = "Tenor" { \voiceOne \TimeKey \TenorMusic }
      \new Voice = "Bass"  { \voiceTwo \BassMusic }
    >>
  >>
}
@end lilypond

@cindex verse and refrain

We end with an example to show how we might code a solo verse which
continues into a two-part refrain in two staves.  The positioning
of the sequential and simultaneous sections to achieve this within
a single score is quite tricky, so follow the explanation carefully!

Let's start with a score block containing a @code{ChoirStaff}, as
we would like the brace to appear at the start of the chorus.
Normally you would need angle brackets after @code{\new ChoirStaff}
to bring in all the staves in parallel, but here we want to
defer the parallelism during the solo so we use braces, although
angle brackets here wouldn't hurt.  Inside the @code{ChoirStaff} we
want first the staff which will contain the verse.  This must
contain notes and lyrics in parallel, so here we need angle
brackets around the @code{\new Voice} and @code{\new Lyrics} to
start them at the same time:

@lilypond[quote,verbatim,ragged-right]
versenotes = \relative c'' {
  \clef "treble"
  \key g \major
  \time 3/4
  g g g | b b b |
}
versewords = \lyricmode {
  One two three four five six
}
\score {
  \new ChoirStaff {
    \new Staff <<
      \new Voice = "verse" {
        \versenotes \break
      }
      \new Lyrics \lyricsto verse {
        \versewords
      }
    >>
  }
}
@end lilypond

That gives the verse line.

Now we want to continue with refrainA on the same staff while a
second staff is introduced in parallel with it for refrainB, so
this is a parallel section which must be positioned immediately
following the @code{\break} in the verse Voice.  Yes, @emph{within}
the verse Voice!  Here's that parallel section.  More staves
could be introduced here in the same way.

@example
<<
  \refrainnotesA
  \new Lyrics \lyricsto verse @{
    \refrainwordsA
  @}
  \new Staff <<
    \new Voice = "refrainB" @{
      \refrainnotesB
    @}
    \new Lyrics \lyricsto "refrainB" @{
      \refrainwordsB
    @}
  >>
>>
@end example

Here's the final result with two staves in the chorus showing
how the parallel section is positioned within the verse Voice:

@lilypond[quote,verbatim, ragged-right]
versenotes = \relative c'' {
  \clef "treble"
  \key g \major
  \time 3/4
  g g g | b b b |
}
refrainnotesA = \relative c'' {
  \time 2/4
  c c | g g \bar "|."
}
refrainnotesB = \relative c {
  \clef "bass"
  \key g \major
  c e | d d |
}
versewords = \lyricmode {
  One two three four five six
}
refrainwordsA = \lyricmode {
  la la la la
}
refrainwordsB = \lyricmode {
  dum dum dum dum
}
\score {
  \new ChoirStaff {
    \new Staff <<
      \new Voice = "verse" {
        \versenotes \break
        <<
          \refrainnotesA
          \new Lyrics \lyricsto "verse" {
            \refrainwordsA
          }
          \new Staff <<
            \new Voice = "refrainB" {
              \refrainnotesB
            }
            \new Lyrics \lyricsto "refrainB" {
              \refrainwordsB
            }
          >>
        >>
      }
      \new Lyrics \lyricsto "verse" {
        \versewords
      }
    >>
  }
}
@end lilypond

@cindex book, example of using
@funindex \book
@funindex book

However, although this is an interesting and useful exercise to
help you to understand how sequential and simultaneous blocks work,
in practice one would perhaps choose to code this as two
@code{\score} blocks within an implicit @code{\book} block, as
follows:

@lilypond[quote,verbatim,ragged-right]
versenotes = \relative c'' {
  \clef "treble"
  \key g \major
  \time 3/4
  g g g | b b b |
}
refrainnotesA = \relative c'' {
  \time 2/4
  c c | g g \bar "|."
}
refrainnotesB = \relative c {
  \clef "bass"
  \key g \major
  c e | d d |
}
versewords = \lyricmode {
  One two three four five six
}
refrainwordsA = \lyricmode {
  la la la la
}
refrainwordsB = \lyricmode {
  dum dum dum dum
}
\score {
  \new Staff <<
    \new Voice = "verse" {
      \versenotes
    }
    \new Lyrics \lyricsto "verse" {
      \versewords
    }
  >>
}

\score {
  \new ChoirStaff <<
    \new Staff <<
      \new Voice = "refrainA" {
        \refrainnotesA
      }
      \new Lyrics \lyricsto "refrainA" {
        \refrainwordsA
      }
    >>
    \new Staff <<
      \new Voice = "refrainB" {
        \refrainnotesB
      }
      \new Lyrics \lyricsto "refrainB" {
        \refrainwordsB
      }
    >>
  >>
}
@end lilypond


@seealso
Notation Reference: @ruser{Vocal music}.


@node Kontextusok és ábrázolók
@section Kontextusok és ábrázolók
@translationof Contexts and engravers


Kontextusok és ábrázolók have been mentioned informally
in earlier sections; we now must look at
these concepts in more detail, as they are important
in the fine-tuning of LilyPond output.


@menu
* A kontextus fogalma::
* Kontextusok létrehozása::
* Az ábrázoló fogalma::
* Kontextusok tulajdonságainak módosítása::
* Ábrázolók hozzáadása és eltávolítása::
@end menu

@node A kontextus fogalma
@subsection A kontextus fogalma
@translationof Contexts explained

@cindex contexts explained

When music is printed, many notational elements which do not
appear explicitly in the input file must be added to the
output.  For example, compare the input and output of the
following example:

@lilypond[quote,verbatim,relative=2,fragment]
cis4 cis2. g4
@end lilypond

The input is rather sparse, but in the output, bar lines,
accidentals, clef, and time signature have been added.  When
LilyPond @emph{interprets} the input the musical information
is parsed from left to right, similar to the way a performer
reads the score.  While reading the input, the program remembers
where measure boundaries are, and which pitches require explicit
accidentals.  This information must be held on several levels.
For example, an accidental affects only a single staff, while
a bar line must be synchronized across the entire score.

Within LilyPond, these rules and bits of information are grouped in
@emph{Contexts}.  We have already introduced the @code{Voice} context.
Others are the @code{Staff} and @code{Score} contexts.  Contexts are
hierarchical to reflect the hierarchical nature of a musical score.
For example: a @code{Staff} context can contain many @code{Voice}
contexts, and a @code{Score} context can contain many @code{Staff}
contexts.

@quotation
@sourceimage{context-example,5cm,,}
@end quotation

Each context has the responsibility for enforcing some notation rules,
creating some notation objects and maintaining the associated
properties.  For example, the @code{Voice} context may introduce an
accidental and then the @code{Staff} context maintains the rule to
show or suppress the accidental for the remainder of the measure.

As another example, the synchronization of bar lines is, by default,
handled in the @code{Score} context.
However, in some music we may not want the bar lines to be
synchronized -- consider a polymetric score in 4/4 and 3/4 time.
In such cases, we must modify the default settings of the
@code{Score} and @code{Staff} contexts.

For very simple scores, contexts are created implicitly, and you need
not be aware of them.  For larger pieces, such as anything with more
than one staff, they must be
created explicitly to make sure that you get as many staves as you
need, and that they are in the correct order.  For typesetting pieces
with specialized notation, it is usual to modify existing, or
even to define totally new, contexts.

In addition to the @code{Score,} @code{Staff} and
@code{Voice} contexts there are contexts which fit between
the score and staff levels to control staff groups, such as the
@code{PianoStaff} and @code{ChoirStaff} contexts.  There
are also alternative staff and voice contexts, and contexts for
lyrics, percussion, fret boards, figured bass, etc.

The names of all context types are formed from one or more
words, each word being capitalized and joined immediately to the
preceding word with no hyphen or underscore, e.g.,
@code{GregorianTranscriptionStaff}.


@seealso
Notation Reference: @ruser{A kontextus fogalma}.


@node Kontextusok létrehozása
@subsection Kontextusok létrehozása
@translationof Creating contexts


@funindex \new
@funindex new
@cindex new contexts
@cindex creating contexts
@cindex contexts, creating

In an input file a score block, introduced with a @code{\score}
command, contains a single music expression and an associated
output definition (either a @code{\layout} or a @code{\midi} block).
The @code{Score} context is usually left to be created automatically
when the interpretation of that music expression starts.

For scores with only one voice and one staff, the @code{Voice} and
@code{Staff} contexts may also be left to be created automatically,
but for more complex scores it is necessary to create them by hand.
The simplest command that does this is @code{\new}.  It is prepended
to a music expression, for example

@example
\new @var{type} @var{music-expression}
@end example

@noindent
where @var{type} is a context name (like @code{Staff} or
@code{Voice}).  This command creates a new context, and starts
interpreting the @var{music-expression} within that context.

(Note that a @code{\new Score} command is not normally required,
as the essential top-level @code{Score} context is created
automatically when the music expression within the @code{\score}
block is interpreted.  The only reason for creating a @code{Score}
context explicitly using @code{\new Score} is to introduce a
@code{\with} block in which one or more score-wide default values
of context properties may be specified.  Information on using
@code{\with} blocks can be found under the heading
@qq{Setting context properties with @code{\\with} } in
@ref{Kontextusok tulajdonságainak módosítása}.)

You have seen many practical examples which created new
@code{Staff} and @code{Voice} contexts in earlier sections, but
to remind you how these commands are used in practice, here's an
annotated real-music example:

@lilypond[quote,verbatim,ragged-right]
\score {  % start of single compound music expression
  <<  % start of simultaneous staves section
    \time 2/4
    \new Staff {  % create RH staff
      \key g \minor
      \clef "treble"
      \new Voice {  % create voice for RH notes
        \relative c'' {  % start of RH notes
          d4 ees16 c8.
          d4 ees16 c8.
        }  % end of RH notes
      }  % end of RH voice
    }  % end of RH staff
    \new Staff <<  % create LH staff; needs two simultaneous voices
      \key g \minor
      \clef "bass"
      \new Voice {  % create LH voice one
        \voiceOne
        \relative g {  % start of LH voice one notes
          g8 <bes d> ees, <g c>
          g8 <bes d> ees, <g c>
        }  % end of LH voice one notes
      }  % end of LH voice one
      \new Voice {  % create LH voice two
        \voiceTwo
        \relative g {  % start of LH voice two notes
          g4 ees
          g4 ees
        }  % end of LH voice two notes
      }  % end of LH voice two
    >>  % end of LH staff
  >>  % end of simultaneous staves section
}  % end of single compound music expression
@end lilypond

(Note how all the statements which open a block with either a
curly bracket, @code{@{}, or double angle brackets, @code{<<},
are indented by two further spaces, and the corresponding
closing bracket is indented by exactly the same amount.  While
this is not required, following this practice will greatly
reduce the number of @q{unmatched bracket} errors, and is
strongly recommended.  It enables the structure of the music to
be seen at a glance, and any unmatched brackets will be obvious.
Note too how the LH staff is created using double angle brackets
because it requires two voices for its music, whereas the RH staff
is created with a single music expression surrounded by curly
brackets because it requires only one voice.)

@cindex contexts, naming
@cindex naming contexts

The @code{\new} command may also give an identifying name to the
context to distinguish it from other contexts of the same type,

@example
\new @var{type} = @var{id} @var{music-expression}
@end example

Note the distinction between the name of the context type,
@code{Staff}, @code{Voice}, etc, and the identifying name of a
particular instance of that type, which can be any sequence of letters
invented by the user.  Digits and spaces can also be used in the
identifying name, but then it has to be placed in quotes,
i.e. @code{\new Staff = "MyStaff 1" @var{music-expression}}.
The identifying name is used to
refer back to that particular instance of a context.  We saw this in
use in the section on lyrics, see @ref{Szólamok és vokális zene}.


@seealso
Notation Reference: @ruser{Kontextusok létrehozása}.


@node Az ábrázoló fogalma
@subsection Az ábrázoló fogalma
@translationof Engravers explained

@cindex engravers

Every mark on the printed output of a score produced by LilyPond
is produced by an @code{Engraver}.  Thus there is an engraver
to print staves, one to print note heads, one for stems, one for
beams, etc, etc.  In total there are over 120 such engravers!
Fortunately, for most scores it is not necessary to know about
more than a few, and for simple scores you do not need to know
about any.

Engravers live and operate in Contexts.  Engravers such as the
@code{Metronome_mark_engraver}, whose action and output apply to the
score as a whole, operate in the highest level context -- the
@code{Score} context.

The @code{Clef_engraver} and @code{Key_engraver} are to be
found in every @code{Staff} Context, as different staves may require
different clefs and keys.

The @code{Note_heads_engraver} and @code{Stem_engraver} live
in every @code{Voice} context, the lowest level context of all.

Each engraver processes the particular objects associated
with its function, and maintains the properties that relate
to that function.  These properties, like the properties
associated with contexts, may be modified to change the
operation of the engraver or the appearance of those elements
in the printed score.

Engravers all have compound names formed from words which
describe their function.  Just the first word is capitalized,
and the remainder are joined to it with underscores.  Thus
the @code{Staff_symbol_engraver} is responsible for creating the
lines of the staff, the @code{Clef_engraver} determines and sets
the pitch reference point on the staff by drawing a clef symbol.

Here are some of the most common engravers together with their
function.  You will see it is usually easy to guess the function
from the name, or vice versa.

@multitable @columnfractions .3 .7
@headitem Engraver
  @tab Function
@item Accidental_engraver
  @tab Makes accidentals, cautionary and suggested accidentals
@item Beam_engraver
  @tab Engraves beams
@item Clef_engraver
  @tab Engraves clefs
@item Completion_heads_engraver
  @tab Splits notes which cross bar lines
@item Dynamic_engraver
  @tab Creates hairpins and dynamic texts
@item Forbid_line_break_engraver
  @tab Prevents line breaks if a musical element is still active
@item Key_engraver
  @tab Creates the key signature
@item Metronome_mark_engraver
  @tab Engraves metronome marking
@item Note_heads_engraver
  @tab Engraves note heads
@item Rest_engraver
  @tab Engraves rests
@item Staff_symbol_engraver
  @tab Engraves the five (by default) lines of the staff
@item Stem_engraver
  @tab Creates stems and single-stem tremolos
@item Time_signature_engraver
  @tab Creates time signatures
@end multitable

@smallspace

We shall see later how the output of LilyPond can be changed
by modifying the action of Engravers.


@seealso
Internals reference: @rinternals{Engravers and Performers}.


@node Kontextusok tulajdonságainak módosítása
@subsection Kontextusok tulajdonságainak módosítása
@translationof Modifying context properties

@cindex context properties
@cindex context properties, modifying
@cindex modifying context properties
@funindex \set
@funindex set
@funindex \unset
@funindex unset

Contexts are responsible for holding the values of a number of
context @emph{properties}.  Many of them can be changed to
influence the interpretation of the input and so change the
appearance of the output.  They are changed by the
@code{\set} command.  This takes the form

@example
\set @emph{ContextName}.@emph{propertyName} = #@emph{value}
@end example

Where the @emph{ContextName} is usually @code{Score},
@code{Staff} or @code{Voice}.  It may be omitted,
in which case the current context (typically @code{Voice}) is assumed.

The names of context properties consist of words joined
together with no hyphens or underscores, all except the
first having a capital letter.  Here are a few examples
of some commonly used ones.  There are many more.

@c attempt to force this onto a new page
@need 50
@multitable @columnfractions .25 .15 .45 .15
@headitem propertyName
  @tab Type
  @tab Function
  @tab Example Value
@item extraNatural
  @tab Boolean
  @tab If true, set extra natural signs before accidentals
  @tab @code{#t}, @code{#f}
@item currentBarNumber
  @tab Integer
  @tab Set the current bar number
  @tab @code{50}
@item doubleSlurs
  @tab Boolean
  @tab If true, print slurs both above and below notes
  @tab @code{#t}, @code{#f}
@item instrumentName
  @tab Text
  @tab Set the name to be placed at the start of the staff
  @tab @code{"Cello I"}
@item fontSize
  @tab Real
  @tab Increase or decrease the font size
  @tab @code{2.4}
@item stanza
  @tab Text
  @tab Set the text to print before the start of a verse
  @tab @code{"2"}
@end multitable

@noindent
where a Boolean is either True (@code{#t}) or False (@code{#f}),
an Integer is a positive whole number, a Real is a positive
or negative decimal number, and text is enclosed in double
apostrophes.  Note the occurrence of hash signs,
(@code{#}), in two different places -- as part of the Boolean
value before the @code{t} or @code{f}, and before @emph{value}
in the @code{\set} statement.  So when a Boolean is being
entered you need to code two hash signs, e.g., @code{##t}.

@cindex properties operating in contexts
@cindex setting properties within contexts

Before we can set any of these properties we need to know
in which context they operate.  Sometimes this is obvious,
but occasionally it can be tricky.  If the wrong context
is specified, no error message is produced, but the expected
action will not take place.  For example, the
@code{instrumentName} clearly lives in the @code{Staff} context, since
it is the staff that is to be named.
In this example the first staff is labeled, but not the second,
because we omitted the context name.

@lilypond[quote,verbatim,ragged-right]
<<
  \new Staff \relative c'' {
    \set Staff.instrumentName = #"Soprano"
    c4 c
 }
  \new Staff \relative c' {
  \set instrumentName = #"Alto"  % Wrong!
  d4 d
 }
>>
@end lilypond

Remember the default context name is @code{Voice}, so the second
@code{\set} command set the property @code{instrumentName} in the
@code{Voice} context to @qq{Alto}, but as LilyPond does not look
for any such property in the @code{Voice} context, no
further action took place.  This is not an error, and no error
message is logged in the log file.

Similarly, if the property name is mis-spelt no error message is
produced, and clearly the expected action cannot be performed.  In
fact, you can set any (fictitious) @q{property} using any name you
like in any context that exists by using the @code{\set} command.  But
if the name is not known to LilyPond it will not cause any action to
be taken.  Some text editors with special support for LilyPond input
files document property names with bullets when you hover them with
the mouse, like JEdit with LilyPondTool, or highlight unknown property
names differently, like ConTEXT.  If you do not use an editor with
such features, it is recommended to check the property name in the
Internals Reference: see @rinternals{Tunable context properties}, or
@rinternals{Contexts}.

The @code{instrumentName} property will take effect only
if it is set in the @code{Staff} context, but
some properties can be set in more than one context.
For example, the property @code{extraNatural} is by
default set to ##t (true) for all staves.
If it is set to ##f (false) in one particular @code{Staff}
context it applies just to the accidentals on that staff.
If it is set to false in the @code{Score} context
it applies to all staves.

So this turns off extra naturals in one staff:

@lilypond[quote,verbatim,ragged-right]
<<
  \new Staff \relative c'' {
    ais4 aes
  }
  \new Staff \relative c'' {
    \set Staff.extraNatural = ##f
    ais4 aes
  }
>>
@end lilypond

@noindent
and this turns them off in all staves:

@lilypond[quote,verbatim,ragged-right]
<<
  \new Staff \relative c'' {
    ais4 aes
  }
  \new Staff \relative c'' {
    \set Score.extraNatural = ##f
    ais4 aes
  }
>>
@end lilypond

As another example, if @code{clefTransposition} is set in
the @code{Score} context this immediately changes the value
of the octavation in all current staves and sets a new default
value which will be applied to all staves.

The opposite command, @code{\unset}, effectively removes the
property from the context, which causes most properties to
revert to their default value.  Usually @code{\unset} is not
required as a new @code{\set} command will achieve what is
wanted.

The @code{\set} and @code{\unset} commands can appear anywhere
in the input file and will take effect from the time they are
encountered until the end of the score or until the property is
@code{\set} or @code{\unset} again.  Let's try changing the
font size, which affects the size of the note heads (among
other things) several times.  The change is from the default
value, not the most recently set value.

@lilypond[quote,verbatim,ragged-right,relative=1,fragment]
c4
% make note heads smaller
\set fontSize = #-4
d e
% make note heads larger
\set fontSize = #2.5
f g
% return to default size
\unset fontSize
a b
@end lilypond

We have now seen how to set the values of several different types of
property.  Note that integers and numbers are always preceded by a
hash sign, @code{#}, while a true or false value is specified by
@code{##t} and @code{##f}, with two hash signs.  A text property
should be enclosed in double quotation signs, as above, although we
shall see later that text can actually be specified in a much more
general way by using the very powerful @code{\markup} command.

@subsubheading Setting context properties with @code{\with}

@funindex \with
@funindex with
@cindex context properties, setting with \with

The default value of context properties may be set at the time the
context is created.  Sometimes this is a clearer way of setting a
property value if it is to remain fixed for the duration of
the context.  When a context is created with a @code{\new}
command it may be followed immediately by a @code{\with @{ .. @}}
block in which the default property values are set.  For example,
if we wish to suppress the printing of extra naturals for the
duration of a staff we would write:

@example
\new Staff \with @{ extraNatural = ##f @}
@end example

@noindent
like this:

@lilypond[quote,verbatim,ragged-right]
<<
  \new Staff
  \relative c'' {
    gis ges aes ais
  }
  \new Staff \with { extraNatural = ##f }
  \relative c'' {
    gis ges aes ais
  }
>>
@end lilypond

Or, if the property override is to be applied to all staves
within the score, it may be appended to an explicit
@code{\new Score} command, like this:

@lilypond[quote,verbatim,ragged-right]
\score {
  \new Score \with { extraNatural = ##f } <<
    \new Staff {
      \relative c'' {
        gis ges aes ais
      }
    }
    \new Staff {
      \relative c'' {
        gis ges aes ais
      }
    }
  >>
}
@end lilypond

Properties set in this way may still be changed dynamically using
@code{\set} and returned to the default value set in the
@code{\with} block with @code{\unset}.

@cindex fontSize, default and setting

So if the @code{fontSize} property is set in a @code{\with} clause
it sets the default value of the font size.  If it is later changed
with @code{\set}, this new default value may be restored with the
@code{\unset fontSize} command.

@subsubheading Setting context properties with @code{\context}

@cindex context properties, setting with \context
@funindex \context
@funindex context

The values of context properties may be set in @emph{all} contexts
of a particular type, such as all @code{Staff} contexts, with a single
command.  The context type is identified by using its
type name, like @code{Staff}, prefixed by a back-slash: @code{\Staff}.
The statement which sets the property value is the same as that in a
@code{\with} block, introduced above.  It is placed in a
@code{\context} block within a @code{\layout} block.  Each
@code{\context} block will affect all contexts of the type specified
throughout the @code{\score} or @code{\book} block in which the
@code{\layout} block appears.  Here is a example to show the format:

@lilypond[verbatim,quote]
\score {
  \new Staff {
    \relative c'' {
      cis4 e d ces
    }
  }
  \layout {
    \context {
      \Staff
      extraNatural = ##t
    }
  }
}
@end lilypond

@noindent
Context properties set in this way may be overridden for particular
instances of contexts by statements in a @code{\with} block, and by
@code{\set} commands embedded in music statements.


@seealso
Notation Reference:
@ruser{Changing context default settings}.
@ruser{The set command}.

Internals Reference:
@rinternals{Contexts},
@rinternals{Tunable context properties}.


@node Ábrázolók hozzáadása és eltávolítása
@subsection Ábrázolók hozzáadása és eltávolítása
@translationof Adding and removing engravers

@cindex engravers, adding
@cindex adding engravers
@cindex engravers, removing
@cindex removing engravers

@funindex \consists
@funindex consists
@funindex \remove
@funindex remove

We have seen that contexts each contain several engravers, each
of which is responsible for producing a particular part of the
output, like bar lines, staves, note heads, stems, etc.  If an
engraver is removed from a context, it can no longer produce its
output.  This is a crude way of modifying the output, but it
can sometimes be useful.

@subsubheading Changing a single context

To remove an engraver from a single context we use the
@code{\with} command placed immediately after the context creation
command, as in the previous section.

As an illustration, let's repeat an example from the previous section
with the staff lines removed.  Remember that the staff lines are
produced by the @code{Staff_symbol_engraver}.

@lilypond[quote,verbatim,ragged-right]
\new Staff \with {
  \remove "Staff_symbol_engraver"
}
\relative c' {
  c4
  \set fontSize = #-4  % make note heads smaller
  d e
  \set fontSize = #2.5  % make note heads larger
  f g
  \unset fontSize  % return to default size
  a b
}
@end lilypond

@cindex ambitus engraver

Engravers can also be added to individual contexts.
The command to do this is

@code{\consists @var{Engraver_name}},

@noindent
placed inside a @code{\with} block.  Some vocal scores have an ambitus
placed at the beginning of a staff to indicate the range of notes in
that staff -- see @rglos{ambitus}.  The ambitus is produced by the
@code{Ambitus_engraver}, which is not normally included in any
context.  If we add it to the @code{Voice} context, it calculates the
range from that voice only:

@lilypond[quote,verbatim,ragged-right]
\new Staff <<
  \new Voice \with {
    \consists "Ambitus_engraver"
  }
  \relative c'' {
    \voiceOne
    c a b g
  }
  \new Voice
  \relative c' {
    \voiceTwo
    c e d f
  }
>>
@end lilypond

@noindent
but if we add the ambitus engraver to the
@code{Staff} context, it calculates the range from all
the notes in all the voices on that staff:

@lilypond[quote,verbatim,ragged-right]
\new Staff \with {
    \consists "Ambitus_engraver"
  }
  <<
  \new Voice
  \relative c'' {
    \voiceOne
    c a b g
  }
  \new Voice
  \relative c' {
    \voiceTwo
    c e d f
  }
>>
@end lilypond

@subsubheading Changing all contexts of the same type

@funindex \layout
@funindex layout

The examples above show how to remove or add engravers to
individual contexts.  It is also possible to remove or add
engravers to every context of a specific type by placing the
commands in the appropriate context in a @code{\layout}
block.  For example, if we wanted to show an ambitus for every
staff in a four-staff score, we could write

@lilypond[quote,verbatim,ragged-right]
\score {
  <<
    \new Staff <<
      \relative c'' {
        c a b g
      }
    >>
    \new Staff <<
      \relative c' {
        c a b g
      }
    >>
    \new Staff <<
      \clef "G_8"
      \relative c' {
        c a b g
      }
    >>
    \new Staff <<
      \clef "bass"
      \relative c {
        c a b g
      }
    >>
  >>
  \layout {
    \context {
      \Staff
      \consists "Ambitus_engraver"
    }
  }
}
@end lilypond

@noindent
The values of context properties may also be set
for all contexts of a particular type by including the
@code{\set} command in a @code{\context} block in the
same way.


@seealso
Notation Reference: @ruser{Modifying context plug-ins},
@ruser{Changing context default settings}.


@node A sablonok kibővítése
@section A sablonok kibővítése
@translationof Extending the templates

You've read the tutorial, you know how to write music, you
understand the fundamental concepts.  But how can you
get the staves that you want?  Well, you can find lots of
templates (see @ref{Templates}) which may give you a start.
But what if you want something that isn't covered there?  Read on.

@menu
* Szoprán és cselló::
* Négyszólamú vegyeskar::
* Kotta létrehozása az alapoktól::
* Kevesebb gépelés változókkal és függvényekkel::
* Partitúra és szólamkották::
@end menu

@node Szoprán és cselló
@subsection Szoprán és cselló
@translationof Soprano and cello

@cindex template, modifying
@cindex modifying templates

Start off with the template that seems closest to what you want to
end up with.  Let's say that you want to write something for
soprano and cello.  In this case, we would start with the
@q{Notes and lyrics} template (for the soprano part).

@example
\version @w{"@version{}"}
melody = \relative c' @{
  \clef treble
  \key c \major
  \time 4/4
  a4 b c d
@}

text = \lyricmode @{
  Aaa Bee Cee Dee
@}

\score @{
  <<
    \new Voice = "one" @{
      \autoBeamOff
      \melody
    @}
    \new Lyrics \lyricsto "one" \text
  >>
  \layout @{ @}
  \midi @{ @}
@}
@end example

Now we want to add a cello part.  Let's look at the @q{Notes only} example:

@example
\version @w{"@version{}"}
melody = \relative c' @{
  \clef treble
  \key c \major
  \time 4/4
  a4 b c d
@}

\score @{
  \new Staff \melody
  \layout @{ @}
  \midi @{ @}
@}
@end example

We don't need two @code{\version} commands.  We'll need the
@code{melody} section.  We don't want two @code{\score} sections
-- if we had two @code{\score}s, we'd get the two parts separately.
We want them together, as a duet.  Within the @code{\score}
section, we don't need two @code{\layout} or @code{\midi}.

If we simply cut and paste the @code{melody} section, we would
end up with two @code{melody} definitions.  This would not generate
an error, but the second one would be used for both melodies.
So let's rename them to make them distinct.  We'll call the
section for the soprano @code{sopranoMusic} and the section for
the cello @code{celloMusic}.  While we're doing this, let's rename
@code{text} to be @code{sopranoLyrics}.  Remember to rename both
instances of all these names -- both the initial definition (the
@code{melody = \relative c' @{ } part) and the name's use (in the
@code{\score} section).

While we're doing this, let's change the cello part's staff --
celli normally use bass clef.  We'll also give the cello some
different notes.

@example
\version @w{"@version{}"}
sopranoMusic = \relative c' @{
  \clef treble
  \key c \major
  \time 4/4
  a4 b c d
@}

sopranoLyrics = \lyricmode @{
  Aaa Bee Cee Dee
@}

celloMusic = \relative c @{
  \clef bass
  \key c \major
  \time 4/4
  d4 g fis8 e d4
@}

\score @{
  <<
    \new Voice = "one" @{
      \autoBeamOff
      \sopranoMusic
    @}
    \new Lyrics \lyricsto "one" \sopranoLyrics
  >>
  \layout @{ @}
  \midi @{ @}
@}
@end example

This is looking promising, but the cello part won't appear in the
score -- we haven't used it in the @code{\score} section.  If we
want the cello part to appear under the soprano part, we need to add

@example
\new Staff \celloMusic
@end example

@noindent
underneath the soprano stuff.  We also need to add @code{<<} and
@code{>>} around the music -- that tells LilyPond that there's
more than one thing (in this case, two @code{Staves}) happening
at once.  The @code{\score} looks like this now:

@c Indentation in this example is deliberately poor
@example
\score @{
  <<
    <<
      \new Voice = "one" @{
        \autoBeamOff
        \sopranoMusic
      @}
      \new Lyrics \lyricsto "one" \sopranoLyrics
    >>
    \new Staff \celloMusic
  >>
  \layout @{ @}
  \midi @{ @}
@}
@end example

@noindent
This looks a bit messy; the indentation is messed up now.  That is
easily fixed.  Here's the complete soprano and cello template.

@lilypond[quote,verbatim,ragged-right,addversion]
sopranoMusic = \relative c' {
  \clef treble
  \key c \major
  \time 4/4
  a4 b c d
}

sopranoLyrics = \lyricmode {
  Aaa Bee Cee Dee
}

celloMusic = \relative c {
  \clef bass
  \key c \major
  \time 4/4
  d4 g fis8 e d4
}

\score {
  <<
    <<
      \new Voice = "one" {
        \autoBeamOff
        \sopranoMusic
      }
      \new Lyrics \lyricsto "one" \sopranoLyrics
    >>
    \new Staff \celloMusic
  >>
  \layout { }
  \midi { }
}
@end lilypond


@seealso
The starting templates can be found in the @q{Templates} appendix,
see @ref{Single staff}.


@node Négyszólamú vegyeskar
@subsection Négyszólamú vegyeskar
@translationof Four-part SATB vocal score

@cindex template, SATB
@cindex SATB template

Most vocal scores of music written for four-part mixed choir
with orchestral accompaniment such as Mendelssohn's Elijah or
Handel's Messiah have the choral music and words on four
staves, one for each of SATB, with a piano reduction of the
orchestral accompaniment underneath.  Here's an example
from Handel's Messiah:

@c The following should appear as music without code
@lilypond[quote,ragged-right]
global = { \key d \major \time 4/4 }
sopranoMusic = \relative c'' {
  \clef "treble"
  r4 d2 a4 | d4. d8 a2 | cis4 d cis2 |
}
sopranoWords = \lyricmode {
  Wor -- thy is the lamb that was slain
}
altoMusic = \relative a' {
  \clef "treble"
  r4 a2 a4 | fis4. fis8 a2 | g4 fis e2 |
}
altoWords = \sopranoWords
tenorMusic = \relative c' {
  \clef "G_8"
  r4 fis2 e4 | d4. d8 d2 | e4 a, cis2 |
}
tenorWords = \sopranoWords
bassMusic = \relative c' {
  \clef "bass"
  r4 d2 cis4 | b4. b8 fis2 | e4 d a'2 |
}
bassWords = \sopranoWords
upper = \relative a' {
  \clef "treble"
  \global
  r4 <a d fis>2 <a e' a>4
  <d fis d'>4. <d fis d'>8 <a d a'>2
  <g cis g'>4 <a d fis> <a cis e>2
}
lower = \relative c, {
  \clef "bass"
  \global
  <d d'>4 <d d'>2 <cis cis'>4
  <b b'>4. <b' b'>8 <fis fis'>2
  <e e'>4 <d d'> <a' a'>2
}

\score {
  <<  % combine ChoirStaff and PianoStaff in parallel
    \new ChoirStaff <<
      \new Staff = "sopranos" <<
        \set Staff.instrumentName = #"Soprano"
        \new Voice = "sopranos" {
          \global
          \sopranoMusic
        }
      >>
      \new Lyrics \lyricsto "sopranos" {
        \sopranoWords
      }
      \new Staff = "altos" <<
        \set Staff.instrumentName = #"Alto"
        \new Voice = "altos" {
          \global
          \altoMusic
        }
      >>
      \new Lyrics \lyricsto "altos" { \altoWords }
      \new Staff = "tenors" <<
        \set Staff.instrumentName = #"Tenor"
        \new Voice = "tenors" {
          \global
          \tenorMusic
        }
      >>
      \new Lyrics \lyricsto "tenors" { \tenorWords }
      \new Staff = "basses" <<
        \set Staff.instrumentName = #"Bass"
        \new Voice = "basses" {
          \global
          \bassMusic
        }
      >>
      \new Lyrics \lyricsto "basses" {
        \bassWords
      }
    >>  % end ChoirStaff
    \new PianoStaff <<
      \set PianoStaff.instrumentName = #"Piano"
      \new Staff = "upper" \upper
      \new Staff = "lower" \lower
    >>
  >>
}
@end lilypond

None of the templates provides this layout exactly.  The nearest is
@q{SATB vocal score and automatic piano reduction} -- see @ref{Vocal
ensembles} -- but we need to change the layout and add a piano
accompaniment which is not derived automatically from the vocal parts.
The variables holding the music and words for the vocal parts are
fine, but we shall need to add variables for the piano reduction.

The order in which the contexts appear in the ChoirStaff of the
template do not correspond with the order in the vocal score shown
above.  We need to rearrange them so there are four staves with the
words written directly underneath the notes for each part.  All the
voices should be @code{\voiceOne}, which is the default, so the
@code{\voiceXXX} commands should be removed.  We also need to specify
the tenor clef for the tenors.  The way in which lyrics are specified
in the template has not yet been encountered so we need to use the
method with which we are familiar.  We should also add the names of
each staff.

Doing this gives for our ChoirStaff:

@example
    \new ChoirStaff <<
      \new Staff = "sopranos" <<
        \set Staff.instrumentName = #"Soprano"
        \new Voice = "sopranos" @{
          \global
          \sopranoMusic
        @}
      >>
      \new Lyrics \lyricsto "sopranos" @{
        \sopranoWords
     @}
      \new Staff = "altos" <<
        \set Staff.instrumentName = #"Alto"
        \new Voice = "altos" @{
          \global
          \altoMusic
        @}
      >>
      \new Lyrics \lyricsto "altos" @{
        \altoWords
      @}
      \new Staff = "tenors" <<
        \set Staff.instrumentName = #"Tenor"
        \new Voice = "tenors" @{
          \global
          \tenorMusic
        @}
      >>
      \new Lyrics \lyricsto "tenors" @{
        \tenorWords
      @}
      \new Staff = "basses" <<
        \set Staff.instrumentName = #"Bass"
        \new Voice = "basses" @{
          \global
          \bassMusic
        @}
      >>
      \new Lyrics \lyricsto "basses" @{
        \bassWords
      @}
    >>  % end ChoirStaff
@end example

Next we must work out the piano part.  This is
easy - we just pull out the piano part from the
@q{Solo piano} template:

@example
\new PianoStaff <<
  \set PianoStaff.instrumentName = #"Piano  "
  \new Staff = "upper" \upper
  \new Staff = "lower" \lower
>>
@end example

and add the variable definitions for @code{upper}
and @code{lower}.

The ChoirStaff and PianoStaff must be combined
using angle brackets as we want them to be
stacked one above the other:

@example
<<  % combine ChoirStaff and PianoStaff one above the other
  \new ChoirStaff <<
    \new Staff = "sopranos" <<
      \new Voice = "sopranos" @{
        \global
        \sopranoMusic
      @}
    >>
    \new Lyrics \lyricsto "sopranos" @{
      \sopranoWords
     @}
    \new Staff = "altos" <<
      \new Voice = "altos" @{
        \global
        \altoMusic
      @}
    >>
    \new Lyrics \lyricsto "altos" @{
      \altoWords
    @}
    \new Staff = "tenors" <<
      \clef "G_8"  % tenor clef
      \new Voice = "tenors" @{
        \global
        \tenorMusic
      @}
    >>
    \new Lyrics \lyricsto "tenors" @{
      \tenorWords
    @}
    \new Staff = "basses" <<
      \clef "bass"
      \new Voice = "basses" @{
        \global
        \bassMusic
      @}
    >>
    \new Lyrics \lyricsto "basses" @{
      \bassWords
    @}
  >>  % end ChoirStaff

  \new PianoStaff <<
    \set PianoStaff.instrumentName = #"Piano"
    \new Staff = "upper" \upper
    \new Staff = "lower" \lower
  >>
>>
@end example

Combining all these together and adding the music
for the three bars of the example above gives:

@lilypond[quote,verbatim,ragged-right,addversion]
global = {
  \key d \major
  \time 4/4
}
sopranoMusic = \relative c'' {
  \clef "treble"
  r4 d2 a4 | d4. d8 a2 | cis4 d cis2 |
}
sopranoWords = \lyricmode {
  Wor -- thy is the lamb that was slain
}
altoMusic = \relative a' {
  \clef "treble"
  r4 a2 a4 | fis4. fis8 a2 | g4 fis fis2 |
}
altoWords = \sopranoWords
tenorMusic = \relative c' {
  \clef "G_8"
  r4 fis2 e4 | d4. d8 d2 | e4 a, cis2 |
}
tenorWords = \sopranoWords
bassMusic = \relative c' {
  \clef "bass"
  r4 d2 cis4 | b4. b8 fis2 | e4 d a'2 |
}
bassWords = \sopranoWords
upper = \relative a' {
  \clef "treble"
  \global
  r4 <a d fis>2 <a e' a>4
  <d fis d'>4. <d fis d'>8 <a d a'>2
  <g cis g'>4 <a d fis> <a cis e>2
}
lower = \relative c, {
  \clef "bass"
  \global
  <d d'>4 <d d'>2 <cis cis'>4
  <b b'>4. <b' b'>8 <fis fis'>2
  <e e'>4 <d d'> <a' a'>2
}

\score {
  <<  % combine ChoirStaff and PianoStaff in parallel
    \new ChoirStaff <<
      \new Staff = "sopranos" <<
        \set Staff.instrumentName = #"Soprano"
        \new Voice = "sopranos" {
          \global
          \sopranoMusic
        }
      >>
      \new Lyrics \lyricsto "sopranos" {
        \sopranoWords
      }
      \new Staff = "altos" <<
        \set Staff.instrumentName = #"Alto"
        \new Voice = "altos" {
          \global
          \altoMusic
        }
      >>
      \new Lyrics \lyricsto "altos" {
        \altoWords
      }
      \new Staff = "tenors" <<
        \set Staff.instrumentName = #"Tenor"
        \new Voice = "tenors" {
          \global
          \tenorMusic
        }
      >>
      \new Lyrics \lyricsto "tenors" {
        \tenorWords
      }
      \new Staff = "basses" <<
        \set Staff.instrumentName = #"Bass"
        \new Voice = "basses" {
          \global
          \bassMusic
        }
      >>
      \new Lyrics \lyricsto "basses" {
        \bassWords
      }
    >>  % end ChoirStaff

    \new PianoStaff <<
      \set PianoStaff.instrumentName = #"Piano  "
      \new Staff = "upper" \upper
      \new Staff = "lower" \lower
    >>
  >>
}
@end lilypond


@node Kotta létrehozása az alapoktól
@subsection Kotta létrehozása az alapoktól
@translationof Building a score from scratch

@cindex template, writing your own
@cindex example of writing a score
@cindex writing a score, example
@cindex score, example of writing

After gaining some facility with writing LilyPond code, you
may find that it is easier to build a score from scratch
rather than modifying one of the templates.  You can also
develop your own style this way to suit the sort of music you
like.  Let's see how to put together the score for an organ
prelude as an example.

We begin with a header section.  Here go the title, name
of composer, etc, then come any variable definitions, and
finally the score block.  Let's start with these in outline
and fill in the details later.

We'll use the first two bars of Bach's prelude
based on @emph{Jesu, meine Freude} which is written for two
manuals and pedal organ.  You can see these two bars of music
at the bottom of this section.  The top manual part has two voices,
the lower and pedal organ one each.  So we need four
music definitions and one to define the time signature
and key:

@example
\version @w{"@version{}"}
\header @{
  title = "Jesu, meine Freude"
  composer = "J S Bach"
@}
TimeKey = @{
  \time 4/4
  \key c \minor
@}
ManualOneVoiceOneMusic = @{ s1 @}
ManualOneVoiceTwoMusic = @{ s1 @}
ManualTwoMusic = @{ s1 @}
PedalOrganMusic = @{ s1 @}

\score @{
@}
@end example

For now we've just used a spacer note, @code{s1},
instead of the real music.  We'll add that later.

Next let's see what should go in the score block.
We simply mirror the staff structure we want.
Organ music is usually written on three staves,
one for each manual and one for the pedals.  The
manual staves should be bracketed together, so we
need to use a PianoStaff for them.  The first
manual part needs two voices and the second manual
part just one.

@example
  \new PianoStaff <<
    \new Staff = "ManualOne" <<
      \new Voice @{
        \ManualOneVoiceOneMusic
      @}
      \new Voice @{
        \ManualOneVoiceTwoMusic
      @}
    >>  % end ManualOne Staff context
    \new Staff = "ManualTwo" <<
      \new Voice @{
        \ManualTwoMusic
      @}
    >>  % end ManualTwo Staff context
  >>  % end PianoStaff context
@end example

Next we need to add a staff for the pedal organ.
This goes underneath the PianoStaff, but it must
be simultaneous with it, so we need angle brackets
around the two.  Missing these out would generate
an error in the log file.  It's a common mistake
which you'll make sooner or later!  Try copying
the final example at the end of this section,
remove these angle brackets, and compile it to
see what errors it generates.

@example
<<  % PianoStaff and Pedal Staff must be simultaneous
  \new PianoStaff <<
    \new Staff = "ManualOne" <<
      \new Voice @{
        \ManualOneVoiceOneMusic
      @}
      \new Voice @{
        \ManualOneVoiceTwoMusic
      @}
    >>  % end ManualOne Staff context
    \new Staff = "ManualTwo" <<
      \new Voice @{
        \ManualTwoMusic
      @}
    >>  % end ManualTwo Staff context
  >>  % end PianoStaff context
  \new Staff = "PedalOrgan" <<
    \new Voice @{
      \PedalOrganMusic
    @}
  >>
>>
@end example

It is not necessary to use the simultaneous construct
@code{<< .. >>} for the manual two staff and the pedal organ staff,
since they contain only one music expression, but it does no harm,
and always using angle brackets after @code{\new Staff} is a good
habit to cultivate in case there are multiple voices.  The opposite
is true for Voices: these should habitually be followed by braces
@code{@{ .. @}} in case your music is coded in several variables
which need to run consecutively.

Let's add this structure to the score block, and adjust the indenting.
We also add the appropriate clefs, ensure stems, ties and slurs in
each voice on the upper staff point to the right direction with
@code{\voiceOne} and @code{\voiceTwo}, and enter the time signature
and key to each staff using our predefined variable, @code{\TimeKey}.

@example
\score @{
  <<  % PianoStaff and Pedal Staff must be simultaneous
    \new PianoStaff <<
      \new Staff = "ManualOne" <<
        \TimeKey  % set time signature and key
        \clef "treble"
        \new Voice @{
          \voiceOne
          \ManualOneVoiceOneMusic
        @}
        \new Voice @{
          \voiceTwo
          \ManualOneVoiceTwoMusic
        @}
      >>  % end ManualOne Staff context
      \new Staff = "ManualTwo" <<
        \TimeKey
        \clef "bass"
        \new Voice @{
          \ManualTwoMusic
        @}
      >>  % end ManualTwo Staff context
    >>  % end PianoStaff context
    \new Staff = "PedalOrgan" <<
      \TimeKey
      \clef "bass"
      \new Voice @{
        \PedalOrganMusic
      @}
    >>  % end PedalOrgan Staff
  >>
@}  % end Score context
@end example

That completes the structure.  Any three-staff organ music
will have a similar structure, although the number of voices
may vary.  All that remains now
is to add the music, and combine all the parts together.

@lilypond[quote,verbatim,ragged-right,addversion]
\header {
  title = "Jesu, meine Freude"
  composer = "J S Bach"
}
TimeKey = {
  \time 4/4
  \key c \minor
}
ManualOneVoiceOneMusic = \relative g' {
  g4 g f ees
  d2 c2
}
ManualOneVoiceTwoMusic = \relative c' {
  ees16 d ees8~ ees16 f ees d c8 d~ d c~
  c c4 b8 c8. g16 c b c d
}
ManualTwoMusic = \relative c' {
  c16 b c8~ c16 b c g a8 g~ g16 g aes ees
  f ees f d g aes g f ees d e8~ ees16 f ees d
}
PedalOrganMusic = \relative c {
  r8 c16 d ees d ees8~ ees16 a, b g c b c8
  r16 g ees f g f g8 c,2
}

\score {
  <<  % PianoStaff and Pedal Staff must be simultaneous
    \new PianoStaff <<
      \new Staff = "ManualOne" <<
        \TimeKey  % set time signature and key
        \clef "treble"
        \new Voice {
          \voiceOne
          \ManualOneVoiceOneMusic
        }
        \new Voice {
          \voiceTwo
          \ManualOneVoiceTwoMusic
        }
      >>  % end ManualOne Staff context
      \new Staff = "ManualTwo" <<
        \TimeKey
        \clef "bass"
        \new Voice {
          \ManualTwoMusic
        }
      >>  % end ManualTwo Staff context
    >>  % end PianoStaff context
    \new Staff = "PedalOrgan" <<
      \TimeKey
      \clef "bass"
      \new Voice {
        \PedalOrganMusic
      }
    >>  % end PedalOrgan Staff context
  >>
}  % end Score context
@end lilypond


@node Kevesebb gépelés változókkal és függvényekkel
@subsection Kevesebb gépelés változókkal és függvényekkel
@translationof Saving typing with variables and functions

@cindex variables
@cindex variables

By this point, you've seen this kind of thing:

@lilypond[quote,verbatim,ragged-right]
hornNotes = \relative c'' { c4 b dis c }
\score {
  {
    \hornNotes
  }
}
@end lilypond

You may even realize that this could be useful in minimalist music:

@lilypond[quote,verbatim,ragged-right]
fragmentA = \relative c'' { a4 a8. b16 }
fragmentB = \relative c'' { a8. gis16 ees4 }
violin = \new Staff {
  \fragmentA
  \fragmentA
  \fragmentB
  \fragmentA
}
\score {
  {
    \violin
  }
}
@end lilypond

However, you can also use these variables (also known as
macros, or user-defined commands) for tweaks:

@c TODO Avoid padtext - not needed with skylining
@lilypond[quote,verbatim,ragged-right]
dolce = \markup { \italic \bold dolce }
padText = { \once \override TextScript.padding = #5.0 }
fthenp=_\markup { \dynamic f \italic \small { 2nd } \hspace #0.1 \dynamic p }
violin = \relative c'' {
  \repeat volta 2 {
    c4._\dolce b8 a8 g a b
    \padText
    c4.^"hi there!" d8 e' f g d
    c,4.\fthenp b8 c4 c-.
  }
}
\score {
  {
    \violin
  }
\layout { ragged-right=##t }
}
@end lilypond

These variables are obviously useful for saving
typing.  But they're worth considering even if you
only use them once -- they reduce complexity.  Let's
look at the previous example without any
variables.  It's a lot harder to read, especially
the last line.

@example
violin = \relative c'' @{
  \repeat volta 2 @{
    c4._\markup @{ \italic \bold dolce @} b8 a8 g a b
    \once \override TextScript.padding = #5.0
    c4.^"hi there!" d8 e' f g d
    c,4.\markup @{ \dynamic f \italic \small @{ 2nd @}
      \hspace #0.1 \dynamic p @}
    b8 c4 c-.
  @}
@}
@end example

@c TODO Replace the following with a better example  -td
@c Skylining handles this correctly without padText

So far we've seen static substitution -- when LilyPond
sees @code{\padText}, it replaces it with the stuff that
we've defined it to be (ie the stuff to the right of
@code{padtext=}).

LilyPond can handle non-static substitution, too (you
can think of these as functions).

@lilypond[quote,verbatim,ragged-right]
padText =
#(define-music-function (parser location padding) (number?)
  #{
    \once \override TextScript.padding = #padding
  #})

\relative c''' {
  c4^"piu mosso" b a b
  \padText #1.8
  c4^"piu mosso" d e f
  \padText #2.6
  c4^"piu mosso" fis a g
}
@end lilypond

Using variables is also a good way to reduce work if the
LilyPond input syntax changes (see
@rprogram{Updating files with convert-ly}).  If
you have a single definition (such as @code{\dolce}) for all your
input files (see @ref{Style sheets}), then if the syntax changes, you
only need to update your single @code{\dolce} definition,
instead of making changes throughout every @file{.ly} file.


@node Partitúra és szólamkották
@subsection Partitúra és szólamkották
@translationof Scores and parts

In orchestral music, all notes are printed twice.  Once in a part for
the musicians, and once in a full score for the conductor.  Variables can
be used to avoid double work.  The music is entered once, and stored in
a variable.  The contents of that variable is then used to generate
both the part and the full score.

It is convenient to define the notes in a special file.  For example,
suppose that the file @file{horn-music.ly} contains the following part
of a horn/@/bassoon duo

@example
hornNotes = \relative c @{
  \time 2/4
  r4 f8 a cis4 f e d
@}
@end example

@noindent
Then, an individual part is made by putting the following in a file

@example
\include "horn-music.ly"
\header @{
  instrument = "Horn in F"
@}

@{
 \transpose f c' \hornNotes
@}
@end example

The line

@example
\include "horn-music.ly"
@end example

@noindent
substitutes the contents of @file{horn-music.ly} at this position in
the file, so @code{hornNotes} is defined afterwards.  The command
@code{\transpose f@tie{}c'} indicates that the argument, being
@code{\hornNotes}, should be transposed by a fifth upwards.  Sounding
@code{f} is denoted by notated @code{c'}, which corresponds with the
tuning of a normal French Horn in@tie{}F.  The transposition can be seen
in the following output

@lilypond[quote,ragged-right]
\transpose f c' \relative c {
  \time 2/4
  r4 f8 a cis4 f e d
}
@end lilypond

In ensemble pieces, one of the voices often does not play for many
measures.  This is denoted by a special rest, the multi-measure
rest.  It is entered with a capital @code{R} followed by a duration
(@code{1}@tie{}for a whole note, @code{2}@tie{}for a half note,
etc.).  By multiplying the
duration, longer rests can be constructed.  For example, this rest
takes 3@tie{}measures in 2/4 time

@example
R2*3
@end example

When printing the part, multi-rests
must be condensed.  This is done by setting a run-time variable

@example
\set Score.skipBars = ##t
@end example

@noindent
This command sets the property @code{skipBars} in the
@code{Score} context to true (@code{##t}).  Prepending the rest and
this option to the music above, leads to the following result

@lilypond[quote,ragged-right]
\transpose f c' \relative c {
  \time 2/4
  \set Score.skipBars = ##t
  R2*3
  r4 f8 a cis4 f e d
}
@end lilypond


The score is made by combining all of the music together.  Assuming
that the other voice is in @code{bassoonNotes} in the file
@file{bassoon-music.ly}, a score is made with

@example
\include "bassoon-music.ly"
\include "horn-music.ly"

<<
  \new Staff \hornNotes
  \new Staff \bassoonNotes
>>
@end example

@noindent
leading to

@lilypond[quote,ragged-right]
\relative c <<
  \new Staff {
    \time 2/4
    R2*3
    r4 f8 a cis4 f e d
  }
  \new Staff {
    \clef bass
    r4 d,8 f | gis4 c | b bes |
    a8 e f4 | g d | gis f |
  }
>>
@end lilypond
