I am working with a collection of Lilypond files generated from the Weimer Jazz Database, and I've been trying to understand the rules for chord symbol notation. I've found a useful resource explaining the general rules, but still have a couple of questions about specific details.
First, I haven't found a definitive explanation about the difference between
r for chord notation. My understanding is that
r represents the No Chord symbol, NC. I thought that
s meant repeat the previous chord, but as can be seen here, the sequence
s2. r4 results in:
Another point of confusion I have is with
c1:775+, which I would be tempted to interpret as C7#5 (or C7b13) with an extraneous 7 in the notation, but as the engraved output here shows, is interpreted by Lilypond as C(9)13.
Finally, my understanding is that
es indicates a flat symbol, but as can be seen in the engraved output, this sequence produces
es2:min7 aes2:7 Eb-7 Ab7. I would have written the sequence
I'd appreciate it if someone could help explain these examples, or point me to a definitive guide on Lilypond chord symbol notation.