The Rolling Stones guitarist, whose memoir Life was released yesterday, said he and the former Beatle recently met up on holiday and ended up composing together.
“We were really pleased to see each other,” the Daily Express quoted Richards as saying.
“We fell straight in talking about the past, talking about songwriting. He told me because he was left-handed he and John Lennon could play the guitars like mirrors opposite each other, watching each other’s hands.
“So we started playing like that. We started composing a song together, a McCartney/Richards number whose lyrics were pinned to my wall for many weeks,” he added.