A collaboration with Paul McCartney and John Lennon was in the works after the pair left The Beatles, though it never came to be as Lennon did not show up for one reason

A newly resurfaced love letter from John Lennon to his former wife Cynthia Powell has seen the Beatles frontman take a playful swipe at his bandmate. The letter, which dates back to 1962, marked a crucial year in the band's history,

Paul McCartney and John Lennon met as teenagers. While they would become close, they were awkward when they first met.