He was a groundbreaking player, had a background in classical and jazz with upright bass(and cello). He helped forge a new path in rock bass in the 60’s, moving beyond simple I/V and major/minor triad lines, into ‘lead bass’ concepts, similar to Entwistle, and later Squire. His sound/tone was by default, as he favored Gibson short scale EB3s with hot pickups, into the only British amp loud enough that was available at the time, a Marshall Superbass. Not exactly hi-fidelity, but he worked with it, and it became his unmistakable tone. Granted, in ‘05 he used Hartkes, but a similar Gibson bass(EB1), so he came close to delivering his signature Cream sound(not to disappoint the nostalgia audience, but Clapton was a different story). His solo era stuff was a contrast over the years.