The beat the song is built on is one bar, played through bars 10-16, 18-24 and 42-48, and 3 more places -- 17.2% 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 hi-hat, snare and kick, counted in sixteenth notes. On its own it scores 72 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 118 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 118, 142, 166, 190 and 214 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 hi-hat, snare and kick, in 4/4 at 214 BPM, counted in sixteenth notes. It is written out above, and it covers 17.2% of the bars the kit plays.
Bars 10-16, 18-24, 42-48 and 50-52, and 2 more places. The time is kept on the snare to start with, and it changes 16 times over the song.
72 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.