I always thought Muff Winwood (Spencer Davis Group) and Bill Wyman (the Stones) laid down a pretty solid bottom end for their respective bands. And who could forget Jack Casady (Jeff/Plane) and David Freiberg (QMS)? Both were known for their mountains of onstage gear and truly monstrous sound. Dale Peters (The James Gang) and Felix Pappalardi (Mountain) are a couple of my favorites as well.