Watch the Section 3: Blues online guitar lesson by Brad Carlton from Rhythmology

Harmonic Overview Chords: A7 D7 E7
Street Key: 12 Bar Blues in A
Theory: D:V7 G:V7 A:V7
Modes: A Mix D Mix E Mix
Parent: D Maj G Maj A Maj
Pentatonic Options: A Min Pent, A Blues