The Boss on stage with Patti Smith last night.

Last night the documentary Horses: Patti Smith and Her Band premiered at the Tribeca Film Festival at New York's Beacon Theater. Patti brought along some famous friends to join her and her band in a post-screening performance.

Bruce Springsteen joined Smith on guitar and vocals on "Because the Night," his song that she famously made a hit. The set-closing "People Have the Power" featured Springsteen and Patti's pal, former R.E.M. singer Michael Stipe



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