Russell Crowe stopped by The Tonight Show to promote his new film Noah and served up a show-stopping performance of Johnny Cash's "Folsom Prison Blues" featuring Jimmy Fallon on harmonica with backup from The Roots. While Fallon has been pretty adept at showcasing the hidden talents of his celebrity guests, the backwater blues accompaniment he delivered during their set proves he's got a few more tricks up his sleeve. Check the footage below to watch Russell Crowe's performance with Jimmy Fallon and The Roots. Stay tuned for more from The Tonight Show starring Jimmy Fallon. Catch Russell Crowe's Noah in theaters, today.