Name any hip hop song played on the radio in the past year or so. Did any of the lyrics sound sort of warbly - as if sung by a robot? Chances are, the answer is "Yes." That's called Auto-Tune. And now there's an app for that.Smule, the masterminds behind the smash-hit apps Ocarina and Leaf Trombone, have teamed up with hip hop artist T-Pain (known for calling on Auto-Tune for just about every word he sings) and the makers of Auto-Tune, Antares, to bring the pitch-tweaking tool to the iPhone as I Am T-Pain. Oh - and it works in real time (and we've got hands-on video.)