George Harrison wanted that the guitar’s solo of While My Guitar Gently Weeps actually resembled a cry, but he didn’t want to use wah-wah. He gave it a lot of tries, but was never satisfied so he started to consider the idea of inviting Clapton, his friend since 1964, when he was still the guitarist of the Yardbirds. Clapton was very surprised by the offer because no other musician until then had ever participated in a Beatles song.