Final answer:
Eric Clapton was the first non-Beatle to do a guitar solo on an album by playing on The Beatles' 'While My Guitar Gently Weeps'.
Step-by-step explanation:
The first non-Beatle to do a guitar solo on an album was a) Eric Clapton. He played a memorable guitar solo on the song 'While My Guitar Gently Weeps' by The Beatles, which was included in their White Album released in 1968. Clapton's solo added a bluesy and expressive touch to the song, showcasing his exceptional guitar skills.