Huddie Ledbetter, known as Lead Belly, was a unique figure in the American popular music of the 20th century. Ultimately, he was best remembered for a body of songs that he discovered, adapted, or wrote, including "Goodnight, Irene," "Rock Island Line," "The Midnight Special," and "Cotton Fields." But he was also an early example of a folksinger whose background had brought him into direct contact with the oral tradition by which folk music was handed down, a tradition that, by the early years of the century, already included elements of commercial popular music. Because he wa...