Inspired by a meeting with Pete Seeger, a young Bob Gibson left behind a successful job to collect folk songs. His arrangements, songwriting, and musical innovations took his audiences by storm, lighting the fire that led to the full-blown folk-music revival of the late 1950s. He introduced Joan Baez in 1959, Judy Collins in 1960, and his songs have been recorded by Peter, Paul Mary, Simon Garfunkel, The Kingston Trio, and many others. The book...