
Kid A Mnesia was released in vinyl, CD, cassette and digital versions. In early September, Radiohead posted a comedic video in which Yorke and Radiohead artist Stanley Donwood discussed the channel's declining engagement. Over the course of several months, they posted more than 30 videos.

On 1 April 2021, Radiohead joined the social media platform TikTok and began posting short videos featuring their character Chieftain Mews. Kid Amnesiae also includes alternative versions of "Morning Bell" and the B-sides "Fog" and "Fast-Track", and isolated string tracks from "How to Disappear Completely" and " Pyramid Song". "Pulk/Pull (True Love Waits Version)" is a "harsh, industrial" version of another song, " True Love Waits", with elements of the Amnesiac track "Pulk/Pull Revolving Doors". " Follow Me Around" is a solo acoustic guitar performance by Yorke, with a "soaring" chorus and references to Margaret Thatcher.

" If You Say the Word" features "delicate" fingerpicking, a "foreboding groove", "chiming" percussion and ondes Martenot. "Like Spinning Plates ('Why Us?' Version)" is a piano arrangement of the electronic song "Like Spinning Plates".
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The "deluxe" edition also contains an art book plus Kid Amnesiette, a cassette edition with five B-sides. Kid A Mnesia contains the albums Kid A and Amnesiac, plus a third disc, Kid Amnesiae, comprising previously unreleased material from the Kid A and Amnesiac recording sessions. Kid A was ranked at number 20 in the 2020 edition of Rolling Stone's " 500 Greatest Albums of All Time" list, and Amnesiac at number 320 in the 2012 edition. At the turn of the decade, Rolling Stone, Pitchfork and the Times ranked Kid A the greatest album of the 2000s. The albums divided fans and critics, but later attracted wide acclaim. Radiohead considered releasing the work as a double album, but felt the material was too dense. Departing from Radiohead's earlier guitar-led sound, the albums featured more diverse instrumentation, including the ondes Martenot, programmed electronic beats, strings, and jazz horns.

Radiohead and producer Nigel Godrich recorded Kid A and Amnesiac simultaneously in 19 in studios in Paris, Copenhagen, Gloucester and Oxford.
