The 12 Bar Blues in the key of B contains the chords B7 (I chord), E7 (IV chord) and F#7 (V) chord. Below is the 12 Bar Blues starting on B7.
12 Bar Blues in B (Jazz Variation)
The Jazz variation of the 12 Bar Blues in B adds some extra chords. The 12 Bar Blues structure remains the same, but certain chords are substituted. For example, the B7 chord in the fourth bar is substituted with a F#m7 moving to an B7 chord.
