Music of the Vietnam era had the power to unite and divide, to support and protest, to remind those in-country of home, and to help those at home begin to understand what being in-country meant. It provides a soundtrack that can teach us a lot about the war, the era, and the people who lived it. Michael Croan interviews Doug Bradley, one of the authors of "We Gotta Get Out Of This Place: The Soundtrack of the Vietnam War."