I hate picking favourites. Perhaps Rush's Xanadu:
Other suggestions include:
Genesis - Supper's Ready
Yes - Sound Chaser
Jethro Tull - A Passion Play
Pink Floyd - Pigs
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.