London ? Paul McCartney says it’s time an experimental Beatles track saw the light of day.

McCartney says he wants to release “Carnival of Light,” a 14-minute experimental track the Fab Four recorded in 1967 but never released.

The band played the recording for an audience just once, at an electronic music festival in London. It reportedly includes distorted guitar, organ sounds, gargling and shouts of “Barcelona!” and “Are you all right?” from McCartney and John Lennon.

McCartney would need permission from Ringo Starr and the widows of Lennon and George Harrison to release the track.