Essentially, every American who has listened to the radio or gone to summer camp, knows Guthrie's "This Land Is Your Land." The music of the nation's signature folk singer/songwriter has been recorded by everyone from the Mormon Tabernacle Choir to the Irish rock band U2. Originally blowing out of the Dust Bowl in 1930s Depression-era America, he blended vernacular, rural music and populism to give voice to millions of downtrodden citizens. His is a complex story filled with frenetic creative energy and a treasure trove of cultural history - as well as personal imperfections and profound family tragedy.