Here's a look at a basic way to look at the harmony of this tune:
You context is correct -
It's II V I's in major then in relative minor
For example:
Key of D on alto ( a very common key for this tune is concert F )
II-V-I-IV ( E-7-A7-DM7-GM7) ( normal modes in D )
then to relative minor
ii7b5-V7-i (C#-7b5 F#7b9 B-) ( most basic scale that covers these is B harmonic minor )
Descending thing at the end of the bridge is only difference.
(B- Bb7 |A- Ab7 GM7 |)
Bb7 moving to A- is b2 sub for V7 so it's more or less like E7b9b5 to A-
Ab7 moving to GM7 is b2 sub for V7 so it's more or less like D7b9 b5 to GM7
Lots of choices on this part.
------------------------------
A section
E-7 | A7 | DM7 | GM7 | C#-7b5 |F#7b9| B- |B-
(nice substitution on A section in bar 3 and 4 here is this:
E-7 | A7 | Eb-7 Ab7 | D-7 G7 | C#-7b5 |F#7b9| B- |B- )
B section
C#-7b5 |F#7b9| B- |B-
E-7 | A7 | DM7 | GM7 |
C#-7b5 |F#7b9| B- Bb7 |A- Ab7
GM7 | F#7b9| B- |B- |
You context is correct -
It's II V I's in major then in relative minor
For example:
Key of D on alto ( a very common key for this tune is concert F )
II-V-I-IV ( E-7-A7-DM7-GM7) ( normal modes in D )
then to relative minor
ii7b5-V7-i (C#-7b5 F#7b9 B-) ( most basic scale that covers these is B harmonic minor )
Descending thing at the end of the bridge is only difference.
(B- Bb7 |A- Ab7 GM7 |)
Bb7 moving to A- is b2 sub for V7 so it's more or less like E7b9b5 to A-
Ab7 moving to GM7 is b2 sub for V7 so it's more or less like D7b9 b5 to GM7
Lots of choices on this part.
------------------------------
A section
E-7 | A7 | DM7 | GM7 | C#-7b5 |F#7b9| B- |B-
(nice substitution on A section in bar 3 and 4 here is this:
E-7 | A7 | Eb-7 Ab7 | D-7 G7 | C#-7b5 |F#7b9| B- |B- )
B section
C#-7b5 |F#7b9| B- |B-
E-7 | A7 | DM7 | GM7 |
C#-7b5 |F#7b9| B- Bb7 |A- Ab7
GM7 | F#7b9| B- |B- |