For those of you new to Underworld's mastery of the electronic groove, this song is an excellent starting point. My personal favorite piece is a very subtle but wonderful transition that begins to build approx. 13:00 into the track, and really kicks over at 13:29 or so. It is recognizable if you just listen to that part, but it is best experienced in a dim room, with good headphones (I like Sennheisers but YMMV) or good speakers at decent volume, listening to the entire song while relaxed as hell. You'll know when that transition is without checking the time display; if you've listened to the whole song, it just reaches out and grabs you by the groove gene and yanks you in.