"Where Are Ü Now" is a song produced by American EDM artists Skrillex and Diplo under their collaborative effort Jack Ü, with vocals from Canadian singer Justin Bieber.
The song was released as the second single from the duo's debut studio album, Skrillex and Diplo Present Jack Ü (2015), on their respective labels Owsla and Mad Decent, and is also included on Bieber's fourth studio album Purpose (2015). It was released simultaneously with the album on February 27, 2015, later sent to mainstream radio on April 21, 2015.
Initially, a demo was written by Bieber as a piano ballad titled "The Most"; however, Bieber decided to send the track to the duo, who transformed the track into electronic dance music, but maintained the original lyrics. The song main's instrumentation consists in sharp dancehall stabs and an Eastern melody.
Lyrically, "Where Are Ü Now" talks about caring and praying for an ex who didn't return the favor, and longing for someone who could comfort him in his time of need.
The song was featured on several year-end list of best songs of 2015, being at the top of two publications. It also won a Grammy Award for Best Dance Recording. Commercially, the song peaked at number eight on the Billboard Hot 100, giving both Skrillex and Diplo their first top 10 single on the chart, also giving Bieber his sixth. Internationally, the song has peaked within the top-ten of the charts in eight countries, including Australia, Canada, and the United Kingdom.