22.29Why “backdoor”?
The normal route into C is:
G7 → C.
Backdoor route approaches through borrowed ♭VII7:
B♭7 → C.
Think of it as entering tonic by another doorway.
The name is informal but useful.
22.29 Why “backdoor”?
The normal route into C is:
G7 → C.
Backdoor route approaches through borrowed ♭VII7:
B♭7 → C.
Think of it as entering tonic by another doorway.
The name is informal but useful.