It's Friday, and if there's even an ounce of joy in your heart, drop everything and watch this delightful clip of Jimmy Fallon and Billy Joel nailing a four-part harmony rendition of "The Lion Sleeps Tonight," with an assist from an iPad app.

You could make your own solo barbershop quartet using the same iPad app, Loopy, which loops your voice allowing you to form a musical supergroup if you're alone naked in your bathroom. Lead vocals from the Piano Man not included. [Tonight Show h/t Digg]