The beat the song is built on is a 2-bar phrase, played through bars 1-11, 13-15 and 17-19, and 33 more places -- 76.3% of every bar the kit plays. Learn that one and the song is very nearly finished.
It is played on crash, ride, snare, kick and hi-hat foot, counted in thirty-second notes. On its own it scores 79 out of 100 -- demanding -- and the thing that decides that is the independence between the hands and the feet.
The whole song is 90 out of 100, so the beat is not the hard part: what costs you is everything around it, the joins and the fills.
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 61 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 61, 73, 85, 98 and 110 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, ride, snare, kick and hi-hat foot, in 4/4 at 110 BPM, counted in thirty-second notes. It is written out above, and it covers 76.3% of the bars the kit plays.
Bars 1-11, 13-15, 17-19 and 21-23, and 32 more places.
79 out of 100 on its own -- demanding. The song as a whole is 90 out of 100. Hard, and what makes it hard is the independence between the hands and the feet.