"Instant Karma!" was conceived, written, recorded and released within a period of ten days, making it one of the fastest-released songs in pop music history. The recording was produced by Phil Spector, marking a comeback for the American producer after his self-imposed retirement in 1966, and leading to him being offered the producer's role on the Beatles' "Let It Be" album. Recorded at London's Abbey Road Studios, "Instant Karma!" employs Spector's signature Wall of Sound technique and features contributions from George Harrison, Klaus Voormann, Alan White and Billy Preston. The B-side was "Who Has Seen the Wind?", a song composed and performed by Yoko Ono. When released in the US, the single was given a minor remix by Spector.