Back in April, Diplo revealed that he’d be teaming up with Skrillex during this year’s Mad Decent Block Party to form a super-DJ duo called Jack U. NBD, Just two gigantic EDM stars pooling their knob-twiddling talents together to play a traveling showcase throughout North America. Since then, the pair have been surprisingly low-key (Diplo’s failed bid to set a twerking world record at Electric Zoo notwithstanding). But this past Sunday, Jack U debuted new material while playing the final Mad Decent event, held in San Diego. As RevoltTV points out, Dip and Skril dropped a handful of fresh tracks, the most noteworthy being a collaboration with electro-R&B two-piece AlunaGeorge. Watch the fan-shot footage above to hear the untitled banger, which is exactly the kind of scratchy, soulful hybrid you’d expect. Catch it at the 3:10 mark, but beware: The audio’s a tad blown-out and the camera does more than a little shaking.