 Numerous sound effects, tape loops, and overdubs were recorded and compiled over several sessions almost exclusively by Lennon and Ono, although Harrison provided assistance for spoken overdubs.With more than 40 sources used for "Revolution 9", only small portions of the take 20 coda are heard in the final mix; most prominent from take 20 are Lennon's multiple screams of "right" and "alright", and around a minute near the end featuring Ono's lines up to "you become naked".On 21 June, the first part of take 20 received several overdubs and became officially titled "Revolution 1".