"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 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 Nick 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. Bieber's vocals also suffered alterations in some parts of the song. 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 seventh. Internationally, the song has peaked within the top-ten of the charts in eight countries, including Australia, Canada, and the United Kingdom.

While writing with Jason "Poo Bear" Boyd for his upcoming album at the time, Justin Bieber heard a demo of an instrumental piano ballad Boyd did with Karl Rubin and enjoyed it, calling it "special". Later, he and Boyd "bounced words and melodies back and forth over an instrumental track; when they had the lyrics, Bieber sang take after take so Poo Bear could edit together the best reading of every line and every syllable." The song was recorded as a piano ballad and it took an hour and a half to be recorded. According to Bieber, he didn't want it to be raw, he wanted it to be perfect." Later, in September 2014, during Fashion Week and at an Alexander Wang event, Skrillex and Diplo contacted Bieber's manager Scooter Braun claiming that they were looking for vocal tracks for the debut album by their dance duo Jack Ü and asked him if Bieber had new material. Braun responded positively, claiming that he had an amazing vocal from Bieber with only piano and sent it to Diplo, without Bieber's consent. They decided to collaborate with Bieber as it would be unexpected.

...
Wikipedia