The beat the song is built on is a 2-bar phrase, played through bars 21-27, 29-31 and 33-34, and 2 more places -- 19.7% 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 76 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 74 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 83 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 83, 99, 116, 133 and 150 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 2-bar phrase on crash, hi-hat, snare and kick, in 4/4 at 150 BPM, counted in sixteenth notes. It is written out above, and it covers 19.7% of the bars the kit plays.
Bars 21-27, 29-31, 33-34 and 53-59, and 1 more place. The time is kept on the toms to start with, and it changes 18 times over the song.
76 out of 100 on its own -- demanding. The song as a whole is 74 out of 100: demanding, mostly on how many notes a second it asks for.