The Living Room, an intimate venue on New York’s Lower East Side, has developed a reputation for its loose feel (donations are given in a tip bucket in lieu of an entry fee) and for its status as a location for surprise shows from music’s big names. Artists like Norah Jones, Chip Taylor, and Martha Wainwright have all performed intimate sets there. Last night, the venue saw another superstar performer make a surprise appearance there as Irish country singer Glen Hansard was joined by Bono for an impromptu duet.

The Hansard show was itself a secret show that was being filmed for SiriusXM’s Live At The Loft series. Towards the end of his set, Hansard taught the crowd the chorus to his closing song, Dominic Behan’s “The Auld Triangle,” anticipating a singalong. Hansard then mentioned that “a friend” was going to join him for the song, at which point the Rock and Roll Hall of Famer stepped onstage and performed.

A full fan account of the event can be read here. Below, a video of the once-in-a-lifetime event: