The Phish song, Harry Hood, that I posted earlier is great, but here is another more accessible song for people who are not into Phish yet. The song cuts off before it finishes, but don't let that stop you from listening. It is still great.
I once saw them perform this song and in the middle of the song there was a power failure. Phish did not miss a beat. They continued to play (or pretend to play) even though no one could hear them. At one point they put down their instruments and congregated at the front of the stage playing air instuments (with no sound anywhere). Eventually they picked up their instruments again and continued to play. Then the power came back on without warning and they were in the middle on a mind melting jam and it was like the power never went off. it was absolutely amazing. Another time at another show they were playing this same song. In the middle of it they all started slowing getting down onto their knees, then backs (the drummer and keyboardist has potable instruments) and in the middle of a crazy loud rocking jam they were on their backs hardly moving a muscle. To anyone who did not know, they would have looked like they were asleep or dead aside from their fingers moving. Then without warning they slowly started to get to their feet while continuing to jam. It was a silly thing, but so much fun at the time.
Phish - Possum - Great Western Forum, Inglewood, CA 2-14-03