Although the thought of an Orb live album may raise some eyebrows, the resulting two-CD set is amazing, a complete representation of the group in concert and living proof that techno is indeed a live, as well as recorded, art form. Besides, the consistent Pink Floyd jokes on the record (as well as the brilliant cover art) are hilarious.
If you haven't heard The Orb, you owe it to yourself to check them out. No other artist (that I'm familiar with) has been able to push the bounds of electronic music like these guys. Call them ambient house, call them brilliant, call them what you will. They've done so much it's hard to nail down one song to represent them, but I think "Blue Room" is a good contender.