''I was there, in the Paradise Garage DJ booth with Larry Levan,'' boasted LCD Soundsystem's debut single. Those king-of-the-disco dreams have never sounded truer than on this epic dance-floor freakout, originally offered by Nike and iTunes as an MP3 soundtrack for runners (the CD adds three bonus tracks). 45:33 deftly segues from the smooth funk favored by Levan to synth-pop and Talking Heads-style polyrhythms before opening into serious space-party territory. Forty-six minutes and five miles later, you'll still be smiling. A
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