Heavy is a song by American rock band Linkin Park and American pop singer and songwriter, Kiiara. The song was originally recorded by the band for their seventh studio album, One More Light and is the album's first single. The track is a duet with Kiiara, marking it the first time that Linkin Park has featured a female vocalist on an original song for a studio album. The song was written by Linkin Park, Kiara Saulters, Julia Michaels and Justin Tranter.The single was released for download on February 16, 2017, and was premiered on radio on February 21. A 2-track CD single of the song will be released on March 10, 2017.