Use our acoustic guitar chord charts - from ... 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 key of A.

Harmonic minor keys are used when writing chords. There is another version of the minor key known as the melodic minor. This is used when writing a melody. Each key signature has two possible keys.

Chord hieroglyphics can take several forms. We unravel the mysteries of one of the most symbolic and common examples ...