When dubstep first emerged from South London more than a decade ago, it was an intensely atmospheric, darkly rumbling sub-bass mutation of dub reggae, drum’n’bass, and 2-step garage, turning 140-BPM tracks inside out with a judiciously disorienting use of negative space and half-time tempos. But as the music has moved to North America, artists and fans have gravitated toward the mid-range bass blast of tracks by U.K. producers Rusko and Caspa — with their percussive cussing and master-generator wub-wub-wubbing (see Caspa’s remix of Rusko’s “Cockney Thug”)...

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