will.i.am Performs 'Bang Bang' on 'American Idol'

Before another contestant was eliminated on “American Idol,” will.i.am performed “Bang Bang” off his new album #willpower and The Great Gatsby soundtrack. The Black Eyed Peas hitmaker stepped back in time for the roaring retro performance. Accompanied by a band, he dueted with a flapper girl and showed off his tap-dancing skills. Watch him set it off ’20s style.