"Revolution 9" originated on 30 May 1968 during the first recording session for Lennon's composition "Revolution". Take 20 of that song lasted more than ten minutes and was given additional overdubs over the next two sessions. Mark Lewisohn describes the last six minutes as "pure chaos ... with discordant instrumental jamming, feedback, John repeatedly screaming 'RIGHT' and then, simply, repeatedly screaming ... with Yoko talking and saying such off-the-wall phrases as 'you become naked', and with the overlaying of miscellaneous, home-made sound effects tapes."