The critical role played by Freedom Songs in the voter registration drives, freedom rides, and lunch counter sit-ins during the Civil Rights Movement of the late 1950s and early '60s in the South, gave folk music tremendous new visibility and prestige. The peace movement was likewise energized by the rise of the Campaign for Nuclear Disarmament in the UK, protesting the British testing of the H-bomb in 1958, as well as by the ever-proliferating arms race and the increasingly unpopular Vietnam War. Young singer-songwriter Bob Dylan, playing acoustic guitar and harmonica, had been signed and recorded for Columbia by producer John Hammond in 1961. Dylan's record enjoyed some popularity among Greenwich Village folk-music enthusiasts, but he was "discovered" by an immensely larger audience when a pop-folk-music group, Peter, Paul & Mary had a hit with a cover of his song "Blowin' in the Wind". Peter, Paul & Mary also brought Pete Seeger and the Weavers' "If I Had a Hammer" to nationwide audiences, as well as covering songs by other artists such as Dylan and John Denver.