“Carnival of Light” is one Beatles song that’s unlikely to see the light of day. Recorded on January 5, 1967, during the band’s sessions for “Penny Lane”—initially intended for Sgt. Pepper’s Lonely Hearts Club Band—the 14-minute, avant-garde “Carnival of Light” was commissioned for The Million Volt Light and Sound Rave. The event was held at the Roundhouse Theatre in London from January 28 through February 4, 1967.
An early progenitor of noise rock, and one of the more experimental pieces by the Beatles, “Carnival of Light” was written by McCartney and recorded by the Beatles at Abbey Road Studios. Filled with gargled sounds and vocals, including random bursts of Are you all right? and Barcelona, the track is pressed by heavy organs, echos, and distorted guitars.
“I said all I want you to do is just wander around all the stuff, bang it, shout, play it, it doesn’t need to make any sense,” said McCartney of his instructions to the band while recording the song. “Hit a drum, then wander on to the piano, hit a few notes. Just wander around. So that’s what we did and then put a bit of an echo on it. It’s very free.”
Source: Tina Benitez-Eves/americansongwriter.com