The Boss was in the house.

The crowd that gathered at Duke University’s Page Auditorium expected to hear Rosanne Cash and Mark O’Connor perform. Cash was singing songs from her CD “The List,” which includes a duet with Bruce Springsteen.

On tour, Cash’s lead guitarist normally fills in for Springsteen. Thursday night, however, Cash announced that Springsteen’s vocals would be sung by …

Springsteen walked on stage, and the crowd erupted: Bruce! Bruce! Bruce!

He stayed just long enough to join Cash in singing “Sea of Heartbreak.”

It is believed that Bruce was at Duke visiting the University with his Daughter Jessica who is thinking of attending the school.

A handful of other special guests joined her on the CD, including Elvis Costello for “Heartaches by the Number.”

Alas, Elvis was not in the building.

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