Music typesetting could be provided by GNU LilyPond, http://lilypond.org/. [...]
LilyPond is a plaintext syntax, very TeX-like. It ought to be pretty trivial to create a texvc-like module for Wikipedia that renders LilyPond notation into PNGs. The LilyPond syntax could be put within <music> ... </music> tags, or something similar.
I forgot a few things:
1) LilyPond can also render its input into MIDI files, which might be a cool feature for Wikipedia.
2) LilyPond is already being used by the Mutopia Project, http://www.mutopiaproject.org/. Mutopia is to music what Project Gutenburg http://gutenberg.net/ is to literature.
Okay, I'm done now,
Derek
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