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LilyPond is a music typesetter. It produces beautiful sheet music using a description file as input. LilyPond is part of the GNU Project.
Professional music typesetting, according to the book "The Art Of Music Copying" by Clinton Roemer. Reads MusicXML, CMN, ABC and Guido. Produces MIDI, PostScript, PDF, PNG and SVG; from small images for the web to full printable sheet music.