"Casey" is a song written by Darren Hayes and Peter-John Vettese for Hayes' album This Delicate Thing We've Made. It was released as the fourth and final single from the album, and was his first single to be a download-only release. It managed to chart at #108 in the UK. The original version of the song does not appear on any of the download singles, however a radio edit was made and released. An eighty-second clip of the music video was released by Hayes on his YouTube account on 22 December 2007. The full clip debuted on Hayes' official website and YouTube account on 26 January 2008.