About two years after John Lennon departed from The Beatles, he wrote a letter to Eric Clapton asking him if he was interested in a musical collaboration. The letter, dated September 29th, 1971, reads:

Both of us have been thru the same kind of [difficulties] that I know you’ve had, and I know we could help each other in that area — but mainly Eric — I know I can bring out something great — in fact greater in you that had been so far evident in your music, I hope to bring out the same kind of greatness in all of us — which I know will happen if/when we get together.

Clapton played with Lennon and Yoko’s Plastic Ono Band in 1969 for their 'Live Peace in Toronto' concert and album. Lennon's solo single 'Cold Turkey' also featured Clapton, as did The Beatles’ 1968 'While My Guitar Gently Weeps,' which ranked #7 on Rolling Stone’s list of the 100 Greatest Guitar Songs of All Time.

The handwritten letter by Lennon will be auctioned off at the Profiles in History auction in Los Angeles on December 18th and is expected to sell for $20,000 to $30,000.

Source: LATimes.com