The beat the song is built on is one bar, played through bars 11-43, 45-55 and 61-65, and 4 more places -- 77.2% of every bar the kit plays. Learn that one and the song is very nearly finished.
It is played on hi-hat, snare and kick, counted in sixteenth notes. On its own it scores 71 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 78 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 76 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 76, 91, 107, 122 and 138 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 138 BPM, counted in sixteenth notes. It is written out above, and it covers 77.2% of the bars the kit plays.
Bars 11-43, 45-55, 61-65 and 71-75, and 3 more places. The time is kept on the silence to start with, and it changes 4 times over the song.
71 out of 100 on its own -- demanding. The song as a whole is 78 out of 100: demanding, mostly on the independence between the hands and the feet.