Henning Hraban Ramm <lilypondml@fiee.net> writes:
As is shown e.g. in
https://lilypond.org/doc/v2.22/Documentation/snippets-big-page.de.html
“Changing the chord names to German or semi-German notation”,
\germanChords changes bass notes of chords like a:m/c to lowercase.
While I don’t believe that this is common in Germany, I really would
like to get German chords (i.e. H instead of B) with uppercase bass
notes – as I know it from all my (German) songbooks.
Any accordion music uses uppercase for bass notes and lowercase for
chords.