MuseScore is a free cross platform WYSIWYG music notation
program, licenced under GNU GPL. Features:
  * WYSIWYG, notes are entered on a "virtual note sheet"
  * unlimited number of staves
  * up to four voices/staff
  * easy and fast note entry with mouse, keyboard or midi
  * integrated sequencer and FluidSynth software synthesizer
  * import and export of MusicXml and standard midifiles (SMF)
  * platform independent code for Linux, Windows, Mac

This package builds the legacy version 3.6.2 the last one in
the 3.x series.

Note:
a) MuseScore 3.6.2 is ideal to sync with Ardour - play
   your scores while Ardour plays mp3 covers. Use AI track
   splitting and running a powerful audio system.
b) Note that MuseScore 4.x does not yet support midi sync.