Pete Seeger was a good man. There aren’t many musicians you can say that about without seeming simplistic. Music is often progressed by flawed, volatile, glamorous egotists, and thank God for them. But Seeger carved out his place in history with a quieter, rarer set of qualities: nobility, generosity, humility and, when things got rough, breathtaking courage. Perhaps uniquely, he became one of the most important singers in America without ever being a star, because he believed in the song rather than the singer…