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'Inside Llewyn Davis' star Oscar Isaac does Katy Perry's 'Roar' -- watch it here

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He’s got the eye of the tiger — and an angry tom cat in his overcoat.

Oscar Isaac, the title star of the Coen Brothers’ new ’60s folk-scene chronicle Inside Llewyn Davis, showed up on Jimmy Fallon last night, and of course Jimmy wouldn’t let him leave without proving his real-life music bona fides.

What suits a Dave Van Ronk manque most? A little unknown gem from the Katy Perry catalog, done all Positively 4th Street style, with Fallon on backup:

Inside Llewyn Davis is in theaters now.