Zappa - The Return of the Son of Monster Magnet (sucks, but is this where the band Monster Magnet take their name from?)
Zappa - Lumpy Gravy (moderately interesting)
The Beatles - Revolution 9 (sucks)
John Cage - concerto for prepared piano (terrible)
The one I like:
Spacemen 3 - Dreamweapon (good pot-smoking or background music)
I also have a Milton Babbitt string quartet that could count. I've only bothered to listen to it once but I enjoyed it when it was on.
The Senators just tied it with 1:03 left in the third -- they were down two goals last I looked!