The beat the song is built on is one bar, played through bars 1-7, 9-15 and 29-31, and 9 more places -- 29.7% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on crash, hi-hat, snare and kick, counted in thirty-second notes. On its own it scores 77 out of 100 -- demanding -- 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 thirty-second notes. It is written out above, and it covers 29.7% of the bars the kit plays.
Bars 1-7, 9-15, 29-31 and 45-46, and 8 more places. The time is kept on the hi-hat to start with, and it changes 16 times over the song.
77 out of 100 on its own -- demanding. The song as a whole is 83 out of 100. Hard, and what makes it hard is the independence between the hands and the feet.