Jack Ü (also known as Skrillex and Diplo) are an American DJ duo, side group and collaborative project, consisting of Mad Decent founder Diplo and OWSLA founder Skrillex, formed in 2013. Jack Ü performed at Ultra Music Festival Miami in 2014. They released their first official single "Take Ü There" featuring vocals from Kiesza on September 17, 2014. On February 3, 2015, the trio announced that they would be working with Missy Elliott on a remix to "Take Ü There". They released their debut album Skrillex and Diplo Present Jack Ü on 27 February 2015.
Jack Ü also performed at Ultra Music Festival in 2015 with the entire "Jack Ü crew", featuring live contributions from CL, Kai, Diddy, Kiesza, and Justin Bieber.
Jack Ü's debut performance took place at the Mad Decent Block Party in San Diego on September 15, 2013, which is a nationwide tour that record label Mad Decent puts together in order to showcase different artists signed to the label. Diplo announced the project by releasing the Mad Decent Block Party lineup with Jack Ü playing at multiple stops on the tour. After some guessing by many of who Jack Ü was, Diplo finally came out to reveal that "Jack Ü ... means Skrillex and Diplo together".