WHEN IT COMES to iconic moments in rock history, one can include the Beatles’ rooftop concert, Jimi Hendrix’s literally incendiary set at the Monterey International Pop Festival, the 1973 Kool Herc party that helped launch hip-hop — and, of course, Alice Cooper and the chicken.

In September 1969, Cooper, not yet a household rock-weirdo name, was on the lineup of the Toronto Rock N Roll Revival, a festival that brought together two generations of rock stars. Pioneers like Chuck Berry, Little Richard, and Bo Diddley were on the bill, sharing the day-long stage with relative newcomers like the Doors, Chicago, and Cooper. The event became best known as the moment that John Lennon first stepped outside of the Beatles onstage. His ad-hoc set with the newly configured Plastic Ono Band (Yoko Ono, Eric Clapton, Klaus Voormann, and Alan White) featured covers of rock oldies, his own “Cold Turkey,” and Ono onstage in a bag — anything but Beatle songs. Renowned documentarian D.A. Pennebaker shot most of the day, although the Doors declined to be filmed.

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