When Four Tet announced on Twitter in March 2015 that his next gig would be a back-to-back DJ set with Skrillex, some fans thought it was an early April Fool’s joke. The pairing was surprising, to say the least: Four Tet, the revered producer unspooling intricate rhythms unto “serious” warehouse heads, and Skrillex, the EDM supernova who made “filthy drops” part of dance music vernacular as the American face of a new, head-banging breed of U.K. dubstep? How it even began is unclear, though in June of 2014 Four Tet Tweeted Skrillex while watching the latter performed at the UK.. festival Glastonbury: “watching you and eating donuts. massive,” he wrote, followed by, “saw you in your spaceship.”