From Queenpedia.com

Legendary rock bassist who has played with just about every big name in rock. At times he has been a member of both Whitesnake & Black Sabbath, but his career seems to be littered with times working with very famous names before/after they were REALLY famous.

People with whom he has worked on obscure projects:

Gary Moore

Don Airey

Bil Bruford

Bernie Marsden

John Sykes

Graham Bonnet

Jon Lord

Simon Phillips

Paul Di'Anno

Janick Gers

Pete Willis

Cliver Burr

Tony Martin

He was also the original bass player in the London We Will Rock You musical band. Which is not obscure...