Before he founded Led Zeppelin, Jimmy Page was a very busy man on the London recording scene. In fact, he was one of the top session guitarists of the era. During the mid-1960s, he played the solo on Donovan’s “Sunshine Superman” as well as rhythm guitar on records by The Who and The Kinks.
And when Joe Cocker’s take on “With a Little Help From My Friends” shot to No. 1 in ’69, it went there with Page’s searing lead guitar. Basically, if a producer wanted any sort of guitar work without having to prep the player, he could call Page, who’d get the job done.
That included recordings for film scores. So when Parlophone chief George Martin needed incidental music recorded for a film starring his hot new act, Page got the call. But it wasn’t a situation where Martin wanted to use a session musician over one of The Beatles (as he’d done in the past).
Source: cheatsheet.com