Think of songs you may know: Where Have All the Flowers Gone, We Shall Overcome, The Coming of the Roads, Plane Wreck at Los Gatos. The first frames questions about war and sacrifice in terms both gentle and direct, the second is a gospel song adapted to civil rights and other causes, the third is a story about greed displacing people and landscape, the fourth a ballad which frames questions about identity and compassion in a news story about migrant farm workers.