About LilyPond and MuseScore.

LilyPond and MuseScore are the two most interesting open source projects dedicated to music notation.

LilyPond is a markup language, compatible with LaTeX (I refer you to this my article on LaTeX and LilyPond for writing text and music), that allows you to write musical scores of high graphical quality using text characters.

This feature makes it, among other things, also usable by AI systems, such as ChatGPT, to write autogenerated scores.