The Lomaxes, and other collectors of their time and also decades later, found some of the most powerful vernacular music of the American South in the region\u27s oppressive and violent prison system. The songs they found there, John and Alan Lomax wrote, \u27or songs like them were formerly sung all over the South. With the coming of the machines, however, the work gangs were broken up. The songs then followed group labor into its last retreat, the road gang and the penitentiary\u27 (Our singing country, 1941). Bruce Jackson, writing about prison song in the 1960s, explains \u27Southern agricultural penitentiaries were in many respects replicas of nineteenth-century plantations, where groups of slaves did arduous work by hand, supervised by...