Watch the Double or Nothin' online guitar lesson by Brad Carlton from Chord Studies: Power Chords Vol. 1
In this driving power chord groove we've got two chords: E5 and A5. We are utilizing a common tone shared between both chords. In the E5 you've got your first finger barreing in the fourth and fifth strings and your third and fourth fingers playing the same notes an octave higher. When we play the A5 it's important that you use your fretting hand to mute the low E string that's going to be ringing out.