Orbital - Out There Somewhere (Parts 1 and 2)
Dance/Electronica/IDM, or whatever you want to call it, at its pinnacle.
The album, "In Sides", was released 25 years ago come April, and I never tire of listening to it. It's probably number three in my all time favourite albums, just behind "Unknown Pleasures" and "Closer".
Part 1
Part 2