VIDEO : Madonna's Surprise Paris Performance Calls for Peace

Madonna stepped off the stage after her Paris concert on Wednesday night and invited her fans on Twitter to the Place de la Republique, the site of a memorial to victims of the November 13 terrorist attacks.
This surprise performance had a small crowd, swaying and snapping photos with their cell phones. It wasn't long before a crowd gathered, and social media posts showed up featuring video and photographs of the singer belting out her own songs and other classics, such as John Lennon's "Imagine." In an Instagram post, Madonna said she was singing "songs for peace" with her son David Banda and guitarist Monte Pittman.