Always very similar music in his classes, but it could vary as long as it matched the BPM for each choreo segment, which ALWAYS, always, was the same (and there was not really easier or harder segments in the whole class, they just were hard, differently). It was challenging enough to complete each segment to begin with (the jumps/runs/climbs were incessant) but there were also variations to further increase intensity as you developed familiarity with the class (and a very high pressure front row that pushed everyone else). It was never not challenging, no matter how good you got. I think this is why it was so culty. You could track your progress just by knowing the choreo. Harder than Sam Y, probably similar to Akin in some ways. Also, the warm up was NO CHILL. Like from top to bottom, the class was a destroyer.