Who is Junior Webster from Going Bovine and what is their importance?

Junior Webster is a jazz great who lives in New Orleans, LA. Junior's club is the first stop on the quest to find Dr. X. He has seen the Wizard of Reckoning and is eventually killed by the Wizard. It isn't clear in the book if Junior is already dead when Cameron meets him, but the assumption is that he is and that his club exists in some sort of "other" world.