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 with:

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...