All of Timbaland's best r&b beats-- Ginuwine's "Pony", Destiny's Child's "Get on the Bus", various Aaliyah hits-- are based on his revolutionary decision to make slow jams 300 bpm, in the process creating songs that can turn a party into a dance encyclopedia, slow grinds next to jittery popping. With that foundation Timbaland can do anything he wants. "Cry Me A River" was the last song where he did all the right things: swelling synths, bubbling keys, Justin's Doug E. Fresh beatbox, Tim's own peculiar vocal adlibs buried twenty layers deep, etc. That it coincided perfectly with the teen dream breakup of all time was the kind of dumb luck that makes these songs timeless. Since then, Timbaland's had a bit of a relative slump ("Promiscuous Girl" aside), while Justin's been trying to grow a beard and canoodle with Cammy Cam.