During the Vietnam war, John Balaban traveled the Vietnamese countryside alone, taping, transcribing, and translating oral folk poems known as "ca dao." No one had ever done this before, and it was Balaban's belief that his project would help end the war. The young American poet walked up to farmers, fishermen, seamstresses, and monks and said, "Sing me your favorite poem," and they did. "Folk poetry is so much a part of everybody's life,...