James Szalapski's documentary--filmed in 1975, but not shown until several years later--captures a pivotal point in country music when the the glossiness that had taken over the industry gave way to a back-to-basics movement centered in Austin and Nashville. Young songcrafters such as Guy Clark, Townes Van Zandt, Rodney Crowell, Steve Young, and a young Steve Earle are shown in loose, relaxed performances while The Charlie Daniels Band and David Allan Coe are filmed performing at a Texas holiday concert and at Tennessee State Penitentiary, respectively. Along with presenting personal portraits of these artists, Heartworn Highways effectively preserves an image of two very musical cities and their colorful inhabitants as they were in the middle of the artistically fertile 1970s.