1971 letter proposes group including Klaus Voormann and Phil Spector to ‘bring back the balls in rock’n’roll’

John Lennon wanted Eric Clapton to join a supergroup alongside Phil Spector in the early 1970s in order to “bring back the balls in rock’n’roll”, according to an eight-page letter that is being auctioned.

The letter was written a few weeks after the release of Imagine and showed Lennon considering a dramatic shift in styles as his nascent post-Beatles solo career was taking off.