John Lennon taunted Paul McCartney in an early 1970s letter, accusing him of overstating the Beatles' influence.
"Do you really think most of today's art came about because of the Beatles? I don't believe you're that insane," he wrote. "Didn't we always say we were of the movement - not all of it? Of course we changed the world - but try and follow it through - get off your gold discs and fly!"The undated, six-page letter was made public Thursday. It was written after the group's breakup in 1970.
A copy was given to New York Newsday by autograph dealer Gary Zimlet, who wants to sell it for $125,000.
Lennon was shot to death in 1981 in New York.