Billy Joel, J.K. Simmons, Jimmy Fallon Spontaneously Sing "The Longest Time"

The late-night host and his two guests harmonized on the 1983 track while filming local promos during Wednesday's 'Tonight Show' taping.
'The Tonight Show Starring Jimmy Fallon'  NBC/Screenshot

When it comes to "The Longest Time," everyone has their part.

Therefore, Billy Joel, J.K. Simmons, Jimmy Fallon and Joel's band spontaneously treated the Tonight Show audience to an unrehearsed doo-wop performance of the 1983 track while filming local promos during Wednesday's taping.

Though Fallon, singing the tenor harmonies and solo lines, is the only one with a microphone for the moment, Simmons also shines on those bass riffs. Joel kicks off the song and closes it with somewhat creative gestures to coincide with the final lyrics.

Watch the spontaneous moment below.

Fallon and Joel also sang the Rolling Stones classic "Beast of Burden."

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