"Mile High" is a song by English singer-songwriter and electronic music producer James Blake, featuring guest appearances from American rapper and singer Travis Scott and American record producer Metro Boomin. This single is from Blake's fourth studio album, Assume Form. It was written by the lead and featured artists and produced by Blake, Metro Boomin, Dre Moon and Wavey. It was released on 17 January 2019 having premiered on Zane Lowe's Beats 1 show as the day's World Record.
Musically, "Mile High" is a trap track which features influences from each artist's musical style. Following the track's premiere on Zane Lowe's Beats 1 show, the track was met with positive reviews from music critics, with most praising the three artists' chemistry. In an interview with Zane Lowe of Beats 1, James Blake revealed that the song was created during a recording session that was not initially meant to have anything to do with the album Assume Form. He was listening to Travis Scott singing over Metro Boomin's beat when, impressed, he asked to sing over it. He hailed Scott as "exceptionally talented at melodies" in an interview with Apple Music and also told Dazed that he was impressed at Scott's musical range, saying "he'd just released Astroworld, which is like banger after banger, and then he comes and does this really vulnerable, sweet love song." Blake also praised Metro Boomin, saying "the beat is a huge part of why that track feels the way it does.