Les B refers to "The Thresher" written and recorded by (the greatly underestimated) Phil Ochs. Many of his songs chronicle the times very well. B Seed refers to Woody's "1913 Massacre"; "Ludlow Massacre" and "Harriet Tubman" are excellent too. Nic Jones - never one to give us yet another version of John Barleycorn or Solvey - recorded unusual songs about Napoleon (why's he so popular in English folk song?) and Marlborough - well worth a listen. I wonder what the earliest is? Mine is "Fair Rosamund" about Henry ll. Dr John