Slightly off-topic, but a couple of the more powerful open-source music notation pieces are software are Lilypond [1] and Mup [2]. They've both been around for

Slightly off-topic, but a couple of the more powerful open-source music notation pieces are software are Lilypond [1] and Mup [2]. They've both been around for awhile, work from custom text-formats, and support a ton of music typesetting features. [1] http://www.lilypond.org/ http://www.lilypond.org/ [2] http://www.arkkra.com/ http://www.arkkra.com/