 The Beatles each prepared loops at home, and a selection of these sounds were then added to the musical backing of "Tomorrow Never Knows".The process was carried out live, with multiple tape recorders running simultaneously, and some of the longer loops extending out of the control room and down the corridor.The inclusion of reversed tape sounds on "Rain" (specifically, a portion of Lennon's vocal part) marked the first pop release to use this technique, although the Beatles had first used it, in some of the tape loops and the overdubbed guitar solo, on "Tomorrow Never Knows".