'Supercollider/The Butcher' is a 2011 single released on 12-inch vinyl in the UK, Europe and Japan on 16 April 2011 for Record Store Day. Released on the same format in the United States and Canada on 14 June 2011.
Digital masters of the tracks were released in WAV and MP3 on 18 April 2011 through the The King of Limbs website to those who pre-ordered the album.
'The Butcher' was recorded during the sessions for The King of Limbs, but left off the album. According to the band, 'The Butcher was recorded and mixed during The King of Limbs sessions, but we couldn't make it work on the album'.