If deadmau5’s music is more melodically and sonically expansive than his peers’ output, it’s thanks to his deep roots. His prime-time progressive anthems are inheritors of The Chemical Brothers’ supersized beats and James Holden’s left-field trance. His modular-synth workouts share a lineage with Radiohead’s electronic experiments. And his pensive moods spring from the same source as Boards of Canada’s bottomless melancholy.