This week in Studio 360, using music to change the world. Pete Seeger, who died this week at age 94, told Kurt Andersen a few years ago about his most important work: singing at college campuses for bus fare. And when the Black Panthers wanted to spread their message, they formed an R&B band, complete with jumpsuits. With Koyaanisqatsi, 30 years ago, Godfrey Reggio hoped to change the world; he's still trying in a profound new film, Visitors. Plus, tired of Wes Craven's movies scaring the bejeezus out of you? Here's your chance to get back at him, with our Scary Short Film Fest.