Award Season's Biggest Heartthrob Just Got Hearthrobbier: Oscar Isaac and Jimmy Fallon Do Katy Perry

No late night host is friendlier to musical shenanigans than Jimmy Fallon. Probably because he has the musical chops to join in on the fun. Watch his ask Inside Llewyn Davis’s Oscar Isaac to sing him a little folk ditty. Isaac, adorably, picks my favorite steering wheel jam: Katy Perry’s “Roar.”