Jimmy Fallon, Billy Joel, and an iPad formed a two-man, one-machine doo-wop group Thursday night, turning in a respectable cover of "The Lion Sleeps Tonight." But first, Fallon had to struggle not to fanboy all over the floor while he taught Joel how to use a voice-looping app.

He also got to join his idol for "You May Be Right." The iPad did not. It's probably a little salty about it, honestly.

[H/T: Uproxx]