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Nicholas DiFabbio 
nicholasdifabbio.com
Tomorrow Never Knows
On August 5, 1966 The Beatles released their seventh British album; Revolver. And the last track, emerging from what felt like the depths of eternity was a droning, swirling, sound effect laden opus that would reveal the innovation and new daring direction the group would take from there forward.

At a press conference during their summer 1966 tour in America, the Beatles are asked about this new song.
[Interview]

In January of that year John Lennon was reading a book titled ; The Psychedelic Experience, A Manual Based on the Tibetan Book Of The Dead. [Interview] 

The recording was a technological breakthrough on many levels. The basic track is a drum and bass tape loop which plays one chord over and over.
[Interview]

The vocal was run through a device which was invented by the engineers at Abbey Road Studio called
ADT, short for automatic double tracking.
The swirling seagull and other sound effects were tape loops which Paul McCartney had made at home.
They were faded into the mix simultaneously from separate tape machines in various rooms at Abbey Road studio with each Beatle, producer George Martin, and Engineer Geoff Emerick all manning separate faders on the main mixing console. George Martin has said that the mix could never be duplicated because it was done in real time.

For the last verse, John wanted his voice to sound like it was coming from a mountain top, so Emerick ran the vocal track through a rotating Leslie speaker which can be heard slightly feeding back right after the backward guitar solo.

The resulting recording has been widely characterized as a masterpiece. The Beatles and their creative team at the height of their creative powers, and with Sgt. Pepper still to come.  

This Is Susan Kreutzer for the Beatles, Song By Song.

George Martin and Geoff Emerick
Beatles recording engineer Geoff Emerick
"In its revelation of the man's psychology, THE JOHN LENNON LETTERS far surpasses all previous accounts by wives, lovers, half-siblings, ex-aides, and even the best biographers." -- The Washington Post

Stream the original recording on Apple Music