In the 1960s, folk music transformed itself from a quaint acoustic rural sound into a form of melodic resistance. Today, we are seeing the return of this powerful art form.

Folk music has evolved and changed through the years, but it’s never really gone away. While there are a few stellar folk acts out there in the modern world today, you just can’t beat the classics.

Peter Yarrow, the singer-songwriter best known as one-third of Peter, Paul and Mary, the folk-music trio whose impassioned harmonies transfixed millions as they lifted their voices in favor of civil ...