Initially, this was just the part played by the snares as an exercise for moving singles around a triplet. The first time through is off the right, the second time through is the same pattern but off the left. The quads can play the same pattern as the snares or one of the two demanding parts for the left or right hand. This is the full battery score, snare, quads, bass, cymbal. This audio for the video score is with the quad left-hand pattern (right hand is muted).