Quote Originally Posted by Rythmic
Pachelbel's Canon in D Major. The most relaxing music ever.
I found this energetic version of Pachabel's Cannon on youtube recently:

New Cannon Rock

Perhaps you've see this or similar ones before as they're popular on youtube. This guy is particularly tasteful in most parts (he gets a bit carried away in others). There are other versions on youtube where they managed to sync clips from a bunch of guitarists all over the world doing this--pretty innovative from a i-collaboration standpoint. Enjoy.