Revolution 9

"Revolution 9" is a sound collage from the Beatles' 1968 self-titled double album (also known as the "White Album"). The composition, credited to Lennon–McCartney, was created primarily by John Lennon with assistance from Yoko Ono and George Harrison. Lennon said he was trying to paint a picture of a revolution using sound. The composition was influenced by the avant-garde style of Ono as well as the musique concrète works of composers such as Edgard Varèse and Karlheinz Stockhausen.

The recording began as an extended ending to the album version of Lennon's song "Revolution". Lennon, Harrison and Ono then combined the unused coda with numerous overdubbed vocals, speech, sound effects, and short tape loops of speech and musical performances, some of which were reversed. These were further manipulated with echo, distortion, stereo panning, and fading. At eight minutes and twenty-two seconds, it is the longest track that the Beatles officially released while together as a band.