Freak Out.

That thunderous bassline walks, the white noise snare snaps, and silken vocals glide over possibly the most famous disco track ever created.
The song in question would be Donna Summer's I Feel Love.
I first heard this song as child, but it wouldnt be much later, until drunkenly dancing around a night club, that the 15 minute long synthesiser orgy that is the Patrick Cowley remix was blasted at me. The bass rumbled the floor, and the sounds move through your body like a virus, until you can't control your movement. Never had adding 12 minutes onto an already classic piece of music history proved so succesful. I'd like to see someone not get the urge to dance to this.
Patrick Cowley created an electronic marvel when he re-worked this song, from that single Moog Modular along with the voice of a Disco Siren songstress, it guaranteed this track to become a milestone in electronic music, on a par with Kraftwerk's Autobahn, as truly groundbreaking.
It is a gem that has been dusted off from the bottom of the DJ box, as every electronic club-night in London has been playing it, but for me, it never grows old.