Day & Night (Billie Piper song)

"Day & Night" is a song by English singer turned actress Billie Piper. The song was written by Piper, Eliot Kennedy, Mark Cawley, Mike Percy and Tim Lever for Piper's second album Walk of Life (2000). It was released as the album's lead single on 15 May 2000 to positive reviews from music critics. It was a commercial success, reaching number one in the United Kingdom and was certified silver. According to Piper's autobiography and various sources, the single sold over a quarter of a million copies in the United Kingdom alone.