The drum beat in then prove it in blood.

The beat the song is built on is one bar, played through bars 5-8, 36-37 and 40-43, and 1 more place -- 15.4% of every bar the kit plays. This one moves around more than most: the beat is where to start, not the whole job.

It is played on crash, snare and kick, counted in thirty-second notes. On its own it scores 60 out of 100 -- a step up -- and the thing that decides that is how many notes a second it asks for.

The whole song is 90 out of 100, so the beat is not the hard part: what costs you is everything around it, the joins and the fills.

A part this hard is not learned by playing it slowly and hoping. The room opens it on its simplest reduction -- the timekeeper alone, at 111 BPM -- and adds the notes back over 4 rungs, each with a tempo to reach and a gate to pass before the next.

1. Skeleton. Only the notes that land on a beat. The point is to feel where this bar stands.
2. Kick and snare, whole. The feet and the snare exactly as written, and nothing else. This is the part to know by heart.
3. As written. Open hi-hat, ghost notes, accents and the crash where they belong.

Tempo goes 111, 130, 150 and 170 BPM, and the gate at each one is 8 loops in a row with no wrong note and no wobble in the time.