Sometimes it's not just the hard-core political discussions that change people's thinking. Sometimes it's music. On November 19, we looked back at a special moment in the career of an American musical icon. Johnny Cash isn't necessarily the first person to come to mind when one thinks about 60s protest music. Yet in his new book, A Heartbeat and a Guitar: Johnny Cash and the Making of Bitter Tears, Antonino D'Ambrosio connects Cash to the tradition of folk and political music in America, from Woody Guthrie to Pete Seeger to Bob Dylan and the 60s scene. At the peak of his fame, just after "Ring of Fire," Cash cut a record of songs about the Native American experience, many written by the now-forgotten songwriter Peter La Farge. D'Ambrosio joined us in the GRITtv studio to talk about the history of protest music, the myth of Johnny Cash, and why music is one of the best ways to carry a progressive message.  Then, in a special performance, he was joined by Anthony Roman and David Milone of the band Radio 4 to perform Cash's song "Apache Tears" live.