Jimmy Fallon and Billy Joel Duet on The Tonight Show: Watch Now!

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Jimmy Fallon took a break last night from photobombing with Jon Hamm and getting Lindsay Lohan wet to sing a duet with a music legend.

Billy Joel was a guest on The Tonight Show and Fallon introduced the artst to a voice-looping app that they then used to sing “The Lion Sleeps Tonight."

Know the words? Feel free to sing along.

But not too loudly. You don't wanna overshadow Joel and Fallon.

Watch the performance here and then click through other memorably Jimmy Fallon talk show moments:

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