I have herd punk bands do covers of trad songs...many times they were better than any acoustic version I have heard....these punkers learned them off of the albums of people like the Clancy Brothers, Woody Guthrie, Leadbelly, Pete Seeger and other legendary artists....One time I even heard a punk cover of a Joe Hill song....they lend a new interpretation of the music and the lyrics...and a sense of rough working class power that is sometimes missing when it is unplugged.