Okay, this takes a little explaining, but it's pretty awesome. First, Swizz explains how Pharrell and Q-Tip recommended Justice to him.
And then here's how Swizz turned a line in Justice's "D.A.N.C.E." ("under the spotlight") into the hook for "On to the Next One" ( ... "on to the next one") — fast forward to the 2:00 mark if you can't wait. Amazing. And it's cool they took the time to explain it. Hat tips all around.