Watch Sadisflix. The story behind Johnny Cash's lost Native American-themed concept album and his unique collaboration with folk artist Peter Lafarge. The film also chronicles the reimagining of Cash's highly controversial 1964 record on its 50th anniversary, as recorded at Nashville's historic Sound Emporium Studios. Based on Antonino D'Ambrosio's book "A Heartbeat and a Guitar: Johnny Cash and the Making of Bitter Tears."