new lexer request: LilyPond
GNU LilyPond is a program for engraving musical scores. It works like LaTeX, i.e. the music is written in a plain text format compiled by the program.
I know that some programs can highlight LilyPond code (for example Frescobaldi, which is written in Python), and that work could probably be reused, but as i've never worked on syntax highlighting before i don't know what exactly would be needed - please let me know and i'll try to help.