When Cream broke up in 1968 it was by no means a foregone conclusion that it would be Eric Clapton who would enjoy continued commercial success. After all, it was Jack Bruce who had the looks, and who co-wrote and sang all the band's major hits. But he was a singular talent who wanted to be a pioneer, not just a pop star. His background is in classical music and jazz; at 10 he was winning classical song contests, at 12 composing string quartets and improvising on piano. Then he fell in love with Thelonious Monk and Charlie Mingus and left home at 18 to find his fortune as a jazz bass...