Ray,

I don't have your experience in jazz, so please correct me if I'm wrong, but what you say about C5b versus C#5 sounds like it's a triadic variation of what BIAB calls C7alt. (Note: if you click on the below image, it will take you to the site from which this information was obtained.)



Regards,
Noel


MY SONGS...
Audiophile BIAB 2025