VIDEO : Fallon Channels Sting, Ariana Grande Imitate Britney on 'Tonight'

Jimmy Fallon is a master musical impressionist, with his Neil Young impression alone the stuff of late night legend. But the Tonight Show host found his equal during Tuesday's episode, teaming up with pop singer Ariana Grande for "Wheel of Musical Impressions." Grande channels Christina Aguilera for "The Wheels on the Bus," showing off her impressive vocal range and nodding to the Voice coach's diva-like growls. The duo take turns pressing a "magic button," generating an artist and song.