Use our acoustic guitar chord charts - from basic open ... are more common than basic major, minor and sus chords. The A7, D7 and E9 shapes shown here are all you need for a 12-bar blues improv in the ...

Whether you’re a seasoned improviser or a jam-session novice, you can always refresh those 12-bar blues ... notes come from the minor pentatonic scale. Although the chord has changed to D7 ...