The beat the song is built on is one bar, played through bars 21-22, 41 and 43, and 10 more places -- 16.3% 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, hi-hat, snare and kick, counted in sixteenth notes. On its own it scores 81 out of 100 -- hard -- and the thing that decides that is how many notes a second it asks for.
The whole song is 83 out of 100, so the beat is most of what the song asks for. Get it clean and the rest follows.
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 121 BPM -- and adds the notes back over 5 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 121, 146, 171, 195 and 220 BPM, and the gate at each one is 8 loops in a row with no wrong note and no wobble in the time.
PRACTISE THIS BEAT →A one-bar groove on crash, hi-hat, snare and kick, in 4/4 at 220 BPM, counted in sixteenth notes. It is written out above, and it covers 16.3% of the bars the kit plays.
Bars 21-22, 41, 43 and 45, and 9 more places. The time is kept on the hi-hat to start with, and it changes 21 times over the song.
81 out of 100 on its own -- hard. The song as a whole is 83 out of 100. Hard, and what makes it hard is how many notes a second it asks for.