Drop your sixth string down from E to D for this Tom Morello style riff . The double-stops in bars 2 and 4 and the octaves in bar 3 sound great if slurred instead of picked individually.

Use a solid Marshall type crunch to get the most out of this RATM style riff. Neck single-coil pickup into a Marshall overdrive is the most authentic for Morello-isms but bridge humbucker into heavy distortion would also sound very effective.