The beat the song is built on is one bar, played through bars 3-25, 27-30 and 33-55, and 1 more place -- 90% of every bar the kit plays. Learn that one and the song is very nearly finished.
It is played on crash, snare, mid tom, floor tom and kick, counted in sixteenth notes. On its own it scores 66 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 78 BPM -- and adds the notes back over 4 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 78, 92, 106 and 120 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, snare, mid tom, floor tom and kick, in 4/4 at 120 BPM, counted in sixteenth notes. It is written out above, and it covers 90% of the bars the kit plays.
Bars 3-25, 27-30, 33-55 and 57-60.
66 out of 100 on its own -- demanding. The song as a whole is 74 out of 100: demanding, mostly on the independence between the hands and the feet.