Watch Tony Nominee Andy Karl Deliver a Knockout Performance of Rocky's 'Keep on Standing'

Yo, Adrian! It’s me, Tony nominee Andy Karl! The Rocky leading man, along with members of the cast, stopped by The Late Show on May 1 to perform the 11 o’clock number “Keep on Standing.” That’s the part where Rocky takes to the ring with David Letterman, right? OK, maybe not, but the Italian Stallion is certainly ready for the fight of his life by the end of this number. Take a look at the showstopping performance below, and catch Rocky on Broadway at the Winter Garden Theatre!