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

There's nothing like a poppin', burnin' hot rod twang guitar part. In the lesson we'll cover a standard I IV move with a straight eighth feel, starting with power chords and then moving to Dominant 7th. Finally you'll learn the b3 to 3 move as applied to inversions.
Harmonic Overview Chords: A7 D7
Street Key: A:I7 IV7
Theoretical Key: D: V G: V A Blues
Modes: A Mix D Mix
Parent: D Maj, G Maj - A Dor, G Maj
Pentatonic Options: A Min Pent, A Blues, A Maj Pent,
D Maj Pent