I guess it would have to be:
"All Things Must Pass" by George Harrison
"End of Evangelion OST" by Shiro Sagisu (Which got dumped onto itunes in the wrong friggin order. Yes, that bothers me.)
"Total Pwnage" by Powerglove
"Fire of Unknown Origin" by Blue Oyster Cult
"The Wall" and "Dark Side of the Moon" by Pink Floyd
So, uh, maybe my idea of chilling out is a little different from most peoples', but it works.