On paper the labyrinth of British dance genres and microgenres can seem hopelessly complicated. But at Love D1 emphasized the basics, and he got a big cheer every time he dropped one of the monstrous bass lines that dubstep is known for. Although “bass line” scarcely seems like the right term: the timbres are scrambled and the tones are obliterated; instead of a melodic groove, you get a huge, serrated blob.

Dubstep is one more aftershock of an explosion that happened in the early 1990s, when British producers drew from electronic dance music and dance-hall reggae to create a furiously syncopated genre called jungle — and, later, drum and bass. Since then the sound has been mutating, spinning off new genres as producers and D.J.s change their priorities: hot declaration versus cool abstraction; voices versus beats; fits and starts versus nonstop dancing.