lilypond

GNU music typesetter

LilyPond is a music typesetter. It produces sheet music using a high-level description file, which is plain text, as input. You can use your favorite text editor to enter the description files. The font and the layout were inspired by engraved music, but can be modified. The program also has limited MIDI functionality: you can write MIDI files, and there is a MIDI to lilypond conversion tool, midi2ly. Conversion tools for PMX, MUP, ABC, Finale and Musedata are also included.