By Christian Holub
Updated January 07, 2016 at 01:00 PM EST
Douglas Gorenstein/NBC

Taylor Swift isn’t the only one who can bring friends onstage at concerts.

When Billy Joel came on The Tonight Show Starring Jimmy Fallon to discuss his current Madison Square Garden residency, he suggested bringing host Jimmy Fallon on stage at his Thursday show (much to Questlove’s envy).

“You coming? So we’ll do something on stage,” Joel said.

This would not be the first time Joel and Fallon have musically collaborated. The two reminisced about a party at Howard Stern’s that they spent playing piano and singing doo-wop together. Fallon inherited his love of doo-wop from his father, and the two of them actually met Joel backstage at a previous Madison Square Garden show. According to Joel, he ended up going on late because he got distracted singing doo-wop with the Fallons.

“The crew’s going, ‘You know you’re supposed to be on stage now,’ and I’m like, ‘Wait a minute,'” Joel said. “I would’ve kept going.”

They also got in some practice on Wednesday night. During a commercial break, Fallon and Joel (and fellow guest J.K. Simmons) performed Joel’s doo-wop track “For the Longest Time”; on the proper broadcast, the duo collaborated on a cover of the Rolling Stones’ “Beast of Burden.”

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Joel recently added a 31st show to his current MSG run, and said he’s willing to continue as long as there’s demand.