Lennon performed at Canada's Toronto Rock & Roll Revival, with a hastily assembled Plastic Ono Band - he and his wife Yoko Ono's musical collective - including Eric Clapton, Yes drummer Alan White, and bass player Klaus Voorman, and the footage was captured by fabled filmmaker D.A. Pennebaker, the man behind acclaimed 1967 documentary, "Bob Dylan: Don't Look Back".
The one-day event, held at the University of Toronto, was the brainchild of young music fan John Brower, who also managed to sign up Chuck Berry, Little Richard, Jerry Lee Lewis, Bo Diddley, Gene Vincent, The Doors, and Alice Cooper.
Lennon reportedly had cold feet about his performance and tried to cancel, leaving organisers unsure whether to yank the entire gathering because of poor ticket sales. But once reports reached Toronto that John and Yoko were safely in flight and on their way, fans raced to snap up the remaining tickets - and the festival went ahead.
Songs on Lennon and friends' set list included a cover of "Blue Suede Shoes", "Dizzy Miss Lizzy", The Beatles' "Yer Blues", and the songwriter's new track "Cold Turkey", while Yoko sang "Don't Worry Kyoko".
John and Yoko returned to London after the Toronto set and reportedly decided to leave the Beatles then and there.
Deadline sources reveal "Rock & Roll Revival" will be directed by Ron Chapman and produced by Pennebaker Hegedus Films and Screen Siren Pictures bosses, among others. The 90-minute documentary is expected to hit the film festival circuit next spring (22).