Watch Billy Joel and Jimmy Fallon’s Amazing Layered Doo-Wop Performance

Jimmy Fallon, Billy Joel Sing 'The Lion Sleeps Tonight' (The Huffington Post)

Earworm alert! Once you watch the above clip, you might be hearing "aweema-wep, aweema-wep, aweema-wep, aweema-wep" in your head for the rest of the day.

On last night's "Tonight Show" broadcast, Jimmy Fallon demonstrated a voice-looping iPad app to singer Billy Joel, which the two then used to perform a mostly a cappella version of "The Lion Sleeps Tonight" with a four-part backing track of themselves.