Watch the Step Down online guitar lesson by Brad Carlton from Chord Studies: Evolving Blues Vol. 1
Our next blues is still in the key of A, but incorporates some minor 7 chords. We also use a standard bluesy move in measure 12 as we approach the V chord from a half step above. This creates a resolving feel back to the V chord which then resolves back to the I chord at the beginning of the progression. Isn't it great when things fall into place!