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Billy Joel Busts Out Some Impromptu Doo-Wop On 'The Tonight Show'

One of the best moments from Billy Joel's "Tonight Show" appearance actually happened during a commercial break.
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Billy Joel's appearance on "The Tonight Show" this week was pretty epic.

But one of the best moments of the night actually happened during a commercial break.

"Whoa, for the longest time. Whoa, for the longest," the "Tonight Show" cast sang.

That's right, Joel's backup band, fellow guest J.K. Simmons and Jimmy Fallon decided to put their own spin on one of Joel's greatest hits, "Longest Time." (Video via Sony Music Entertainment / Billy Joel)

And, despite the fact that it seemed totally unplanned, they actually pulled off the impromptu musical number pretty well.

A writer for The Wrap even called the surprise performance "almost flawless."

If you want to hear even more of Joel's impressive pipes, tickets for his upcoming shows are on sale now.

This video includes images from Getty Images.

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