Lennon based the song on his childhood memories of playing in the garden of Strawberry Field, a Salvation Army children's home in Liverpool. Starting in November 1966, the band spent 45 hours in the studio, spread over five weeks, creating three versions of the track. The final recording combined two of those versions, which were entirely different in tempo, mood and musical key. It features reverse-recorded instrumentation, Mellotron flute sounds, an Indian swarmandal, tape loops and a fade-out/fade-in coda, as well as a cello and brass arrangement by producer George Martin. For the promotional film, the band used experimental techniques such as reverse effects, jump-cuts and superimposition.