Be it "Walk This Way," "Combination," "Fever" or his solo riffs, like "Mercy" or "Let the Music ... low E string off, so he had just five strings, which made it easier to play bar chords up ...

but in this instance it is placed in the bass of the chord. In the song it shifts between A and this B7/A chord but the open A string creates a drone between the two chords. Even though the chord ...