This doesn't have to be bass specific, but I think it's fun to think about. For example, I've always had a great appreciation for Mick Fleetwood's drumming, and for some reason have always wondered how the Rolling Stones might have sounded different had he been their drummer rather than Charlie Watts. This is no dig on Charlie whatsoever, nor am I saying that one's better than the other...just an interesting dynamic I've thought about, where I wonder how the musical "stew" might have tasted different. Another for me would have been to have David Hidalgo or perhaps Brian Setzer in the Blasters (again, I love Dave Alvin and know he also wrote much of the songs....it's not about that). Any you think would be interesting?