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.
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