Eric Clapton - The Yardbirds, Cream and Blind Faith
Jimmy Page - The Yardbirds and Led Zeppelin
Jeff Beck - The Yardbirds and the Jeff Beck Group
Steven Stills - Buffalo Springfield and Crosby, Stills and Nash (and Young)
David Crosby - The Byrds and Crosby, Stills and Nash
Graeme Nash - The Hollies and Crosby, Stills and Nash
Paul Carrack - Ace, Squeeze, Roxy Music and Mike and the Mechanics
Jools Holland - Squeeze and his own Rhythm and Blues Orchestra
George Harrison - The Beatles and The Travellin' Wilburys
Jeff Lynne - The Move, The Electric Light Orchestra and The Travellin' Wilburys
Roy Wood - The Move and Wizzard
Bev Bevan - The Move, the ELO and Black Sabbath
Lemmie - Hawkwind and Motorhead
Ritchie Blackmore - Deep Purple and Rainbow
Jon Lord - The Flowerpot Men, Deep Purple, Whitesnake
Ron Wood - The Faces and the Rolling Stones
Kenny Jones - The Small Faces, The Faces and The Who.
Rick Wakeman - The Strawbs and Yes
Ian Gillan - Deep Purple and Black Sabbath
Everybody - John Mayall's Bluesbreakers
There's a few to be going on with. As factor says, there will be no end of them.