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The King of Limbs is the eighth studio album by English alternative rock band Radiohead. It was self-released on 18 February 2011 as a download in MP3 and WAV formats. It was followed by a physical CD and 12" vinyl release on 28 March,[1] along with a wider download release via AWAL,[2] and a special "newspaper" edition on 9 May 2011.[3] The album shares its name with an oak tree in Wiltshire's Savernake Forest, thought to be 1,000 years old.[4]
The physical album was released on the band's Ticker Tape imprint by XL in the United Kingdom, TBD in the United States, and Hostess Entertainment in Japan

"Supercollider"/"The Butcher" is a 2011 single by the English band Radiohead. It was released on 12-inch vinyl in the UK, Europe and Japan on 16 April 2011 for Record Store Day.[1][2] It will be released on the same format in the United States and Canada on 14 June 2011.
"Supercollider" was debuted on 6 June 2008 at Malahide Castle, Dublin.[3] It was subsequently played at various Radiohead and Thom Yorke/Atoms for Peace shows leading up to its official release. "The Butcher" was recorded during the sessions for The King of Limbs, but left off the album. 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 ordered the album in any format before the single was released.
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; "Supercollider" was started during those sessions and finished off in March ofthis year."[4]
"Supercollider" is the longest original studio track released by Radiohead, beating Paranoid Android by 38 seconds.