When Lennon and Clapton played together.

On September 13, 1969, John Lennon performed with the Plastic Ono Band and Eric Clapton at the Toronto Rock and Roll Revival festival.

Held at Toronto’s Varsity Stadium, the festival itself was a bit of a glorious hodgepodge, with some of rock’s founders (including Chuck Berry, Bo Diddley, Little Richard and Jerry Lee Lewis) sharing a stage with some up-and-comers (Alice Cooper, Chicago Transit Authority), with the Doors as the headliners.

Toronto rock promoters John Brower and Kenny Walker organised a festival held at Varsity Stadium on 13 September 1969, around the notion of a revival of rock and roll stars from the 1950s, booking Chuck Berry, Little Richard, Jerry Lee Lewis, Fats Domino, Bo Diddley, and Gene Vincent.

On 12 September, Brower contacted Lennon, who was still a member of the Beatles, to ask him to be the master of ceremonies for the festival.Instead, Lennon offered to perform at…