My collection of Klezmer and other East European Music for C instruments, done in Lilypond
LilyPond is a music engraving program that takes plain text (like d8 a4 d8 a4 g8 f4 e8 g8 f4 g8. a16 bf g for the sequence above) and turns it into easily shared .pdf and .midi files.
Freescobaldi is an editor that is customized for writing Lilypond files.