Four bars of drums, then the Clavinet. All that motion runs in place: dusty rose (Bb) and blush (F) hold the centre from first second to last, and the whole loudness span is 4.2 decibels. The drama lives at the rim: 1,004 sharp attacks against 441 available beats, more than 2 hits for every pulse, evenly furious all the way around. A groove doesn't crescendo; it rides.