Bob Dylan is an American singer-songwriter, artist and writer. He has been influential in popular music and culture for more than five decades. Much of his most celebrated work dates from the 1960s when his songs chronicled social unrest, although Dylan repudiated suggestions from journalists that he was a spokesman for his generation. Nevertheless, early songs such as "Blowin' in the Wind" and "The Times They Are a-Changin'" became anthems for the American civil rights and anti-war movements. Leaving his initial base in the American folk music revival, Dylan's six-minute single "Like a Rolling Stone" altered the range of popular music in 1965. His mid-1960s recordings, backed by rock musicians, reached the top end of the United States music charts while also attracting denunciation and criticism from others in the folk movement.