Attendees at Fortune’s Most Powerful Women Summit were treated to an unexpected musical number this week, the magazine reports.

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During the opening ceremonies, actress Glenn Close took to the stage to announce a new her musical act, “The Bunny Boiler and the Low Bidder.” Bunny Boiler is an allusion to her character in the film Fatal Attraction.

Then Berkshire Hathaway billionaire Warren Buffett joined her on the stage, and the pair performed the big band standard “The glory of love.” They are long-time friends, says Fortune,

Buffett played a white ukulele branded with the logo of his Dairy Queen chain.

Watch it here.

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