Tripped across this interesting little bit in an interview with Jim Steinman, the songwriter behind the classic Meat Loaf album Bat Out Of Hell:
...This goes back to Jim Morrison and The Doors, my favorite group from the '60s. They always used the word Shaman a lot, Shaman being the tribal leader who would conduct the rituals. The sorcerer or the tribal leader and the guy who would hand out the magic mushrooms.
Or the guy who would say the right prayers. Basically it's if the Pope was cool, he'd be a Shaman, the biggest Shaman. It was always interesting to me that Meat [Loaf] was kind of like a Shaman, which is so close to showman. I don't know if there's any connection linguistically but a great showman to me is also a Shaman, in that tears open doorways and lets you see things behind doors that you would never see.
And creates altars so you could worship things that you're not aware of. It shows you the underbelly and that's always interested me more than anything else. What, the secret underbelly of things.