"Collide" is a song performed by British recording artist Leona Lewis and Swedish DJ and record producer Avicii. It was written by Tim Berg, Simon Jeffes, Arash Pournouri, Autumn Rowe, Sandy Wilhelm, with production helmed by Wilhelm under his production name Sandy Vee and The Young Boys. "Collide" is a house inspired love song, that's instrumentation consists of piano riffs and a guitar. The song was recorded for Lewis' third studio album Glassheart, but was not included on the album's final track listing.