Dance-floor kings Skrillex and Diplo show some sophisticated range on their debut album as Jack Ü. “Beats Knockin” turns a New Orleans-style “Triggerman” beat into a synth-heavy workout with MC Fly Boi Keno. Then they immediately flip it on “Take Ü There,” messing with skittering snares and pop melodies atop a juicy, soulful vocal from rave queen Kiesza. There's dark dancehall with Bunji Garlin, low-slung R&B on “Mind,” the tropical-flavored “Where Are Ü Now” with Justin Bieber—Jack Ü is a caffeinated, sensual, super-fun amalgam of everything club music should be.