3 Techniques That Gave "Tomorrow Never Knows" Its Psychedelic Sound

Tape loops The track used multiple tape loops with reversed and sped-up sounds, which were layered to create a swirling, unpredictable texture.

Leslie speaker The tape loops were fed through the studio’s Leslie speaker, a rotating device that added a Doppler-like wobble to the audio.

Rotating speaker on vocals John Lennon’s vocals were run through a rotating speaker, giving them a phased, otherworldly quality that matched the song’s experimental mood.