Broadway's St. James Theatre is getting an extra dose of rock star power this week as Grammy and Oscar-winning musician Melissa Etheridge steps into the role of American Idiot's malevolent drug peddler, St. Jimmy. On February 1, Etheridge took the stage for her first performance and brought the house down. Etheridge continued to show off her musical talents during the show's encore by picking up her own guitar and jamming with the Idiot cast. Take a look at her big night below!