http://wikisophia.org/wiki/Wikitex#Music

I looked through it and the related documentation.

The one page limitation is bound to become a problem sooner or later. But then, even with the one-page limit, having lilypond markup at all would be a cause for celebration among the music editors. http://www.mutopiaproject.org is a repository for full-length scores, and those are better suited to their mission than ours. Some orchestral works, because of the number of parts, could break over one page just for an excerpt of the main theme, though.

Another concern is that Wikitex appears to be using a two-year old version of Lilypond (an experimental 2.0 version). This is particularly a problem because the Lilypond maintainers have not maintained backwards compatability in the input grammar. Therefore, input written for 2.0 can fail with syntax errors in 2.4. I suspect (hope?) that the grammar will begin to stabilize, at least as far as the more commonly used features are concerned.

IIRC, 2.0 had some security holes in it (includes from an arbitrary path for example) that, at best, would require a chroot jail to run on a server of any consequence.

UninvitedCompany