Speaking of weird covers, here's a link to a guy playing Yes' Roundabout on a theatre organ.  And, remarkably, it works pretty well:
 
Disclosure - I was a theatre organ freak before I discovered rock and took lessons on the instrument for three years in my tween years.

Paul,
If your into theatre organs you should check out the Arcada Theatre in St. Charles, Il. They still have a fully functional Geneva pipe organ and still have concerts on occasion from what I have heard. Back in the 70's they used to have a theatre organ concert each year with folks like Virgil Fox and Peter Nero. I ran spot a couple of times. It was usually 2 days with 6 or so performers.  
 
Keith
 
correct typo
 
(Message edited by keith_h on February 13, 2008)