Watch the Mary, Go Round online guitar lesson by Joe Dalton from 50 Acoustic Blues Licks You MUST Know
Mary, Go Round is a turnaround lick that begins on the F#. We are in the key of E. This is a lick that you can use when your progression includes the F# chord before the B7. When memorizing this, you may want to think of each of the positions as a different chord. After you get the hang of the left hand positions, the right hand will take care of making the 2 lines sound musical.