‘Inside Llewyn Davis’ Star Oscar Isaac Performs Katy Perry’s ‘Roar’ on Fallon (Video)

Oscar Isaac is singing his way into stardom as the grumpy, yet talented lead in “Inside Llewyn Davis,” and on Monday he sang his way into the hearts of any Katy Perry fans watching “Late Night With Jimmy Fallon.”

When Fallon handed Isaac a guitar and asked him to play something, the actor opted to finger pick his way through Perry’s “Roar.”




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