423. COMPOSITION OF SONGS BASED ON 4 CHORD PROGRESSIONS OF 4 CHORDS.

 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