Modulation descendante 
vers la sus-dominante  (T > 6)
C   Am   Dm   G
C   Am   Dm   G
C   Am   Dm   G
C   Am   Dm   G

A   F#m  Bm   E
A   F#m  Bm   E
A   F#m  Bm   E
A   F#m  Bm   E