 The effect was employed throughout the initial take of the song but only during the second half of the remake.According to author Andy Babiuk, "Tomorrow Never Knows" marked the first time that a vocal was recorded with a microphone plugged into a Leslie speaker.Much of the backing track for the song consists of a series of prepared tape loops, an idea that originated from McCartney, who, influenced by the work of avant-garde artists such as Karlheinz Stockhausen, regularly experimented with magnetic tape and musique concrète techniques.