An experimental track recorded by the Beatles in 1967 but never released might finally see the light of day if Paul McCartney has his way.

"I like it because it's The Beatles free, going off piste," he said in a BBC Radio 4 interview to be aired Nov. 20.

The Fab Four, shown in a promotional photograph taken in the 1960s, recorded a 14-minute experimental track while working on Penny Lane. (Associated Press)

Parts of the interview were published Sunday in The Observer newspaper.

McCartney said he still had a master tape of the 14-minute piece called Carnival of Light and "the time has come for it to get its moment."

Carnival of Light reportedly includes organ sounds, gargling, distorted guitar music and shouts of "Barcelona!" and "Are you all right?" From McCartney and John Lennon.

The track was put together Jan. 5, 1967, in between working on vocals for Penny Lane at Abbey Road studios.

At the time, McCartney had been commissioned to create a track for the 1967 Million Dollar Light and Volt Sound Rave at the Roundhouse Theatre in London.

He says his inspiration for the piece came from composers Karlheinz Stockhausen and John Cage — perhaps best known for 4'33, a completely silent composition.

"I said to the guys, 'This is a bit indulgent, but would you mind giving me 10 minutes?,'" recalls McCartney.

"All I want you to do is just wander round all the stuff and bang it, shout, play it. Then we put a bit of echo on it. It's very free."

It was played just once for an audience at an electronic music festival in London but was not introduced as a Beatles track.

The 66-year-old musician said he had wanted to include the track on the Beatles' Anthology compilation but the rest of the Fab Four disagreed. George Harrison had called such experimentation "avant-garde a clue," McCartney said.

McCartney would need permission from Ringo Starr and the widows of Lennon (Yoko Ono) and Harrison (Olivia Harrison) to release the track.