Skrillex and Diplo are two of the most famous and influential artists in EDM today so when the two musicians started performing together in 2013 as Jack Ü, dance-music fans were understandably intrigued. The supergroup has rocked such events as the Mad Decent Block Party in San Diego and Miami’s Ultra Music Festival, but its biggest gig by a long shot will go off later this month: On New Year’s Eve, Skrillex and Diplo will co-headline New York’s Madison Square Garden, performing both separately and together in Jack Ü, with support from A$AP Ferg, Rudimental and Yellow Claw.