The National performed a new song, “Prom Song 13th Century (Frankie & Johnny),” at the Greek Theatre in Los Angeles last night. For a helping hand, they brought out St. Vincent, who duetted with Matt Berninger while peering over a lyric sheet on the floor. At the end, they joined hands for a dance and twirl. “I realized I don’t know how to spin somebody,” Berninger said, sadly. Watch it happen below.

Back in 2009, the National and St. Vincent teamed up to cover Crooked Fingers’ “Sleep All Summer.”

Watch St. Vincent’s episode of “Over/Under” on Pitchfork.tv: