Bob Dylan (born Robert Allen Zimmerman; May 24, 1941) is an American singer-songwriter, poet, and painter. He has been a major figure in music for five decades. Much of his most celebrated work dates from the 1960s when he was an informal chronicler, and an apparently reluctant figurehead, of social unrest. Though he is well-known for revolutionizing perceptions of the limits of popular music in 1965 with the six-minute single "Like a Rolling Stone," a number of his earlier songs such as "Blowin' in the Wind" and "The Times They Are a-Changin'" became anthems for the US civil rights and anti-war movements.