Watch the Double Stop Boogie online guitar lesson by David Hamburger from Fingerstyle Blues Factory
The back half of this lick - all of bar 2 - is just an open position A chord boogie figure. What’s new is the fifth-position moves in measure 1. Looking just at the 3rd and 2nd strings, you probably recognize this as a classic electric blues double stop lick, but of course the trick here is get it to work while your thumb is alternating away. (Not only that, but the low bass note is going to the sixth string instead of the fifth string on beat 3.) It may help to think of the left hand as playing basically two three-note chord shapes: an A7 chord where you bar from the fourth string with your index finger at the 5th fret, and a D chord where you bar from the fourth string with your ring finger at the 7th fret.