Oldie but goodie, especially while playing EQ, or in my case, studying the hearts of babies:
Orbital - The Box
http://www.youtube.com/watch?v=yldzeQub4Io
EDiT:
BAH, he cut off like half of part two..
Here is the complete part 2:
http://www.youtube.com/watch?v=VbidDGrPJR8
..and here is another track from that album, which is also sick as fuck:
http://www.youtube.com/watch?v=1DCRLZcjw2E