Protest music seems to ebb and flow in the U.S.--fading in and out depending on the political circumstances. The 60s were a high point, with Bob Dylan and the folk scene, as well as lesser-known songwriters like Peter La Farge, making music about the most important issues of the day. In his new book, A Heartbeat and a Guitar: Johnny Cash and the Making of Bitter Tears, Antonino D'Ambrosio connects Johnny Cash to the 60s protest music 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 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.