I was introduced to this hilarious series on YouTube called "Yacht Rock". I've only watched three episodes..but it's a scream. The send-ups of Hall and Oates and Michael McDonald on episode 1 are priceless.
Anyway, here's a tongue-in-cheek on Tull. See how many of the background songs you can guess. I got 14, although one is a repeat.
http://www.youtube.com/watch?v=zTwZ9J95NkU
Good luck!