George Harrison started playing slide guitar after seeing what Eric Clapton and other great guitarists were doing on the instrument in the mid-1960s. His interest in the sitar had taken over for a bit, but once he dropped it, he felt out of touch with the guitar. So, George decided to start playing slide to freshen up his sound.
Clapton undoubtedly inspired George. The Beatle was content having the Cream guitarist play his solos, but Clapton loved George’s work just as much. George Harrison and Eric Clapton performing together on a TV program in the 1980s.
The guitarists worked together on many projects over the decades, their first being George’s Beatles song “While My Guitar Gently Weeps.” Most of the time, in their collaborations, George let Clapton take the guitar solos. He told Guitar Player that it never hurt his ego. George knew Clapton did things on the guitar that took him ages to figure out.
Source: Hannah Wigandt/ cheatsheet.com