Hi, I use the LilyJazz package (lilyjazz.ily, jazzchords.ily, and jazzextras.ily) to prepare lead sheets.
These packages have to be upgraded with convert.ly before using them - and the fonts copied into Lilypond's font folder. Normally these packages survive the upgrade or throw errors if they haven't. 2.25.11 compilations proceed without error but don't result in any "jazz style" formatting unless they are converted. Laurie Savage https://www.queensofthewest.com/
