In 1932 Florence Reece, the wife of a Kentucky coal miner, wrote one of the classic topical songs preserved in the folk musical revival. The song, "Which Side Are You On?," contrasts the lot of the working class and the bosses, and asks the listener to choose. This politically charged song was performed again during the Civil Rights Movement, with its lyrics appropriate to the 1960s. It was recorded more recently by Billy Bragg. Indeed, the story...