See laso about the 12 bars blues post 396
The basic idea is to have a 3 part song with 2 couple and one refrain
And each couple and the refrain has as chord progression 4 chords A1 B1 A2 B2
The primary choice is that the pairs (A1 B1) and (A2 , B2) are harmonic pairs
Then the relation of the paits may be chormatic , or melodic, or even all the 4 chords
(A1 B1 A2 B2) may be in consecutive harmonic relation.
Examples
SONG A
REFRAIN= 1M7 4M 5M7 1M
1M7 4M 4m 1M
COUPLE1= 6M7 2m 5m7 1M
COUPLE2= 3M7 6m 5M7 1M
SONG B
REFRAIN= 5M7 1M 1M7 4M
COUPLE1= 6M7 2m 1M7 4M
COUPLE2= 3M7 6m 5M7 1M
SONG C
REFRAIN= 5M7 1M 4M 1M
COUPLE1= 7M7 3m 6M7 2m
COUPLE2= 2M7 5m 1M7 4M
