@Letty,
The article is an obituary - briefly, it says "Jack Bruce could play any style, classical, jazz, latin, blues, but what he became famous for was playing the fluid, expressive, wildly melodic and highly charged basslines in rock’s first supergroup, Cream.
A power trio formed in 1966 by Eric Clapton, Cream was a showcase for three of the hottest virtuoso musicians on the London rock scene, Clapton, Bruce and wild drummer Ginger Baker. They were an immediate multi-million selling sensation, a gladiatorial outfit who seemed to be doing musical battle on stage, producing a heavy form of psychedelic blues that heralded the birth of hard rock."