Oscar Isaac stopped by Late Night With Jimmy Fallon this week to promote Inside Llewyn Davis, and he showed off his folk singing skills with an unexpected song. Fallon supplied the guitar, and after quoting his character — "If it was never new and it never gets old, then it's a folk song" — Isaac launched into a really fantastic folk version of Katy Perry's "Roar." It's short but really sweet, especially because at one point Fallon kind of goofs the words but just keeps going with it.
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