minor and sus chords. The A7, D7 and E9 shapes shown here are all you need for a 12-bar blues improv in the key of A. A13 and E7#9 have an edgier sound and work in jazz just as well as blues. Bm7 is ...

minor and sus chords. The A7, D7 and E9 shapes shown here are all you need for a 12-bar blues improv in the key of A. A13 and ...