The Mutopia project is dormant (per admissions and observations from contributors in the project's mailing list), and under current maintainership (or lack thereof) having contributions processed is hit-or-miss[0].
> latex versions of music
Lilypond is not based on (La)TeX, but lilypond-book, a companion utility that processes lilypond files, allows scores (or fragments) to be integrated into LaTeX, DocBook, Texinfo, and HTML documents[1].
(There is a LaTeX package for music typesetting called MusiXTeX[2], which was used by many scores of the former Werner Icking Music Archive, which merged[3] long ago into IMSLP).
