On a front porch in Philadelphia in early 2004, Anand Wilder and Maxwell Kardon sat with a guitar and a banjo and busily fingerpicked to keep their hands from freezing. After a few false starts they settled on a dirge in d-minor and began improvising lyrics about a labor conflict in a Western Pennsylvania coal town that their fathers had learned about from an old folk song taught in Quaker schools in the '50s.

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