Answer by
Anonymous
I-IV-V7 with the occassional II7-V7 substitution.
Very often, Minor chords (ii, iii, and vi) are played as Major 7 chords (II7, III7, and VI7)
Diminished VII chords are almost NEVER played. They are substituted with what's known a "Mountain 7th Chord" - a M7th chord down 1-step from I.