Bob Dylan began as a Woody Guthrie acolyte, imitating the dust-bowl balladeer as faithfully as a baby boomer from Hibbing, Minnesota could. It wasn't long before he found his own voice, spearheading the early-1960s folk revival as well as the singer-songwriter movement, and introducing poetry into pop music. Through countless changes in sound, image, and even religion, he retained his unique artistic vision even when his popularity occasionally waned. By the 20th century's end, Dylan was regarded as one of its greatest artists, a sort of Picasso of pop.