I doubt that a decent DM would allow most rappers into a party. While it's true that they are obsessed with treasure, they tend to abuse the number-of-items-per-slot rule.
Jethro Tull would make a decent adventuring troupe. I can just see Ian Anderson fascinating an orc patrol with 'Thick as a Brick'. "I really don't mind if you sit this one out..."
Yes have serious plane-hopping credentials (Astral Traveller, Close to the Edge, Circus of Heaven), scrying ability (Then, Future Times), advanced knowledge of constructs (Machine Messiah, Awaken) and rituals (er, Ritual).
Jon Anderson (cleric)
Steve Howe (wizard)
Chris Squire (fighter/rogue)
Rick Wakeman (bard with perfom (keyboards) and perform (oratory)). Even if you can't stomach the music, his stories are hilarious. When he rejoined the band recently, Steve Howe allegedly said something along the lines of, "Don't play. Just stick around and tell jokes."
Alan Wright (Barbarian)