Mine's probably pretty obvious, given my username, but here goes.
Trout Mask Replica by
Captain Beefheart and His Magic Band
Every time you listen to it, it sounds fresh, there's always something new to find within the blathering cacophony. I love John "Drumbo" French's drumming with a passion, and Don van Vliet tosses his extraordinary vocal and poetic talents at us amidst the instrumentation. And what's more, it's endorsed by our current president.