I used to have a poster of that Bosch triptych above my bed in the dorm at Oswego... Was that song the one being played by the creature that was using a human as a horn, with the human's derrière as the bell of the horn?

I was singing the regular old traditional version rather than the one we sang with chorus. Since then, though, I have blasted it out of my head with the Muppets Christmas CD.