The 12 Bar Blues in the key of D contains the chords D7 (I chord), G7 (IV chord) and A7 (V) chord. Below is the 12 Bar Blues starting on D7.
12 Bar Blues in D (Jazz Variation)
The Jazz variation of the 12 Bar Blues in D adds some extra chords. The 12 Bar Blues structure remains the same, but certain chords are substituted. For example, the D7 chord in the fourth bar is substituted with a Am7 moving to an D7 chord.
