DM7 G7 CMaj7

Tis is a regular IIm7 V7/I IMA7 cadence in the key of C. Dm7 constitutes the diatonic substitute of the subdominant, G7 is the dominant and Cmaj7 ist the tonic.




F7 Em7 A7

F7 constitutes a tritone substitute of a secondary dominant. It´s the substitute for B7(b9). It´s implied key is E minor.
Em7 A7 is III-7 V7/II in the key of C. It´s implied key is D minor. A7 is a secondary dominant ehich leads toward Dm7.


Am7 D7 Abm7 Db7 CMaj7

Am7 D7 is VIm7 V7/V in the key of C. D7 is a secondary dominant who´s resolution is the dominant of the key (G7), but G7 is not appearing. Instead Db7, the tritone substitution of G7 shows up. Db7 is prepared by its relativ IIm7 (Abm7).

It´s a cool progression to improvise on.