Your second comment where you talk about the distinction between tonal and modal theory is an area that I would really like to fully understand. As an old tutor once told me, “set your goals!”
Well my goals these days are to be able to understand and even compose my own music.
I had a great book once by a guy called Warren Nunes and he covered some really cool sounding jazz chord progressions, I think he went into detail with this kind of theory in there. Unfortunately my head was too young and mixed up at the time to fully take it in. I wish I could find that book now.
Anyway, thanks for your reply, it turned on another little light on my journey.