OK Computer OKNOTOK 1997 2017 is a reissue of the 1997 album OK Computer by the English alternative rock band Radiohead. It was released in June 2017 on XL Recordings following XL's acquisition of Radiohead's back catalogue from EMI in 2016. The album is remastered and includes B-sides released on OK Computer singles, plus three previously unreleased songs: "I Promise", "Man of War", and "Lift". The special boxed edition includes an art book, notes, and a cassette tape of demos and session recordings. Unlike previous Radiohead reissues, released by EMI, the band selected and produced the OKNOTOK material themselves.

Radiohead promoted the release with a teaser campaign of posters and online videos. "I Promise" and "Man of War" were released as singles backed by music videos, followed by a video for "Lift" in September.

Radiohead released OK Computer, their third album, in June 1997 on EMI. It was recorded in 1996 and 1997 at St Catherine's Court, a historic mansion near Bath owned by actress Jane Seymour. It was the first Radiohead album produced by Nigel Godrich, who has produced every Radiohead album since and been characterised as Radiohead's unofficial "sixth member".

OK Computer was the band's first number-one UK chart debut, propelling them to commercial success around the world. "Paranoid Android", "Karma Police" and "No Surprises" were released as singles, of which "Karma Police" was most successful internationally. The album won the Grammy Award for Best Alternative Album and a nomination for Album of the Year.OK Computer went on to become a staple of "best-of" British album lists.

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