It Was You (with Firebeatz)
The highest-paid DJ in the world does know how to throw a good party, bum-rushing the show with big-name guests (Ellie Goulding! Big Sean! Gwen Stefani! Haim!), while swooping and sweeping his way through epic synth-choked choruses. Don't expect subtlety: Harris rarely waits until the second verse to drop climactic surges of digital noise. But he's charming whenever he takes a rare vocal turn (big pre-summer single "Summer"), and he has fun with the turgid squelch of "Slow Acid." And while Big Sean stumbles on the lunkheaded "Open Wide," Gwen and Haim coolly dominate their tracks.