Thanks Andrew for your input. I did write a few manuals (and still do) for some system usage and I know how hard it can be to cover all what a system can do and how to do it.
For the record, I learned a *lot* reading all (most) of the change logs : http://lilypond.org/doc/v2.23/Documentation/changes/ http://lilypond.org/doc/v2.22/Documentation/changes/ http://lilypond.org/doc/v2.20/Documentation/changes/ http://lilypond.org/doc/v2.18/Documentation/changes/ http://lilypond.org/doc/v2.16/Documentation/changes/new-features-in-2_002e16-since-2_002e14 http://lilypond.org/doc/v2.14/Documentation/changes/ I also read "git log -p" on a daily basis. Here are a few of my gotos might it help anyone : https://lilypond.org/doc/v2.23/Documentation/internals/all-layout-objects.html https://lilypond.org/doc/v2.23/Documentation/notation/lilypond-command-index https://lilypond.org/doc/v2.23/Documentation/notation/chord-name-chart.en.html https://lilypond.org/doc/v2.23/Documentation/notation/common-chord-modifiers.en.html http://lilypond.org/doc/v2.23/Documentation/notation/percussion-notes.html http://fritz.rmi.de/dokumentation/lilypond/Documentation/user/lilypond/Chords-mode.html#Chords-mode https://lists.gnu.org/archive/html/lilypond-user/ FWIW -- Pierre-Luc Gauthier
