Hi thanks in advance for answering. I’m learning a tune that is written in D major, where Fs as written are sharp , the arrangement in one measure goes : G Fnat Ab Gb.
Why not just write F instead of G flat?
The piece is in D maj. F would be sharp anyhow.
V7/♭Vis G♭. Or maybe it's the third of the minor chord built on the lowered second degree, or ... – phoog Feb 03 '22 at 11:32