Pete Seeger's humanity shone through his music just as clearly as his commitment to social justice. Forged in the ‘50s folk revival, that merger of the personal and the political provided a model for Joan Baez and Bob Dylan's early songs of yearning. To later acolytes like Bruce Springsteen, he showed how to match those stories with melodies and—in the case of Billy Bragg's “There Is Power in a Union”—choruses sturdy enough for sing-alongs.