beatles' lost track resurfaces

A 14-minute track the Beatles recorded for a 1967 electronic music concert called the Million Volt Light and Sound Rave has survived in the hands of Paul McCartney, who told the BBC he'll likely release it.

The piece, "Carnival of Light," apparently only saw the light of day once -- at that concert -- and was deemed too radical by the band for release. The U.K.'s Guardian newspaper says witnesses to its 1967 live performance describe the track as featuring "the sound of gargled water and strangled shouts from Lennon which vie with church organs and distorted guitar."

The song became a mythic part of Beatles lore, with some even doubting its existence. But McCartney says he has the master recording. "It does exist," he tells the BBC. Observers say the song's reemergence will go a long way toward affirming the Beatles claim to having a forward-thinking, avant-garde bent to their otherwise ultra-popular rock 'n' roll canon.