The beat the song is built on is one bar, played through bars 33-39, 45-63 and 65-71 -- 26% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on hi-hat, snare and kick, counted in thirty-second notes. On its own it scores 25 out of 100 -- a fair first song -- and the thing that decides that is how many limbs land on the same note.
The whole song is 66 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 104 BPM -- and adds the notes back over 3 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 104, 121 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 thirty-second notes. It is written out above, and it covers 26% of the bars the kit plays.
Bars 33-39, 45-63 and 65-71. The time is kept on the hi-hat to start with, and it changes 12 times over the song.
25 out of 100 on its own -- a fair first song. The song as a whole is 66 out of 100: demanding, mostly on the independence between the hands and the feet.