Lilypond is a very good tool, but the part on Gregorian chant is not maintained and very deep modifications would be needed to perfectly align the notes and text.
Note, however, that there are some serious flaws in
LilyPond regarding Gregorian notation (especially the non-modern
version), and right now there is nobody who works on improving that...
Comments
I'm surprised this targets TeX rather than lilypond, which AFAIK is the gold standard for free (as in beer and speech) music engraving.
I checked, and lilypond also offers features for Gregorian chant notation [1]. Has anyone used both and is able to compare?
[1] https://lilypond.org/doc/v2.25/Documentation/notation/typese...
Good question, they considered it at some point:
Source: https://gregorio-project.github.io/gregoriotex/index.html
Circa 2024[1]:
1: https://lists.gnu.org/archive/html/lilypond-user/2024-10/msg...