the artists were American. Prominent artists from this movement include Pete Seeger, Woody Guthrie, The Weavers, Burl Ives, and others. A more commercially oriented version of folk music emerged in the 1960s, including performers such as The Kingston Trio, The Limeliters, The Brothers Four, Peter, Paul and Mary, Joan Baez, The Highwaymen, Judy Collins, The New Christy Minstrels, and Gordon Lightfoot, as well as counterculture and folk rock performers including Bob Dylan, The Byrds, Arlo Guthrie, and Buffy Sainte-Marie. Books Series: Greenwood Guides to American Roots Music, edited by Norm Cohen. Titles include, Folk Music, Country, Blues, Jazz, and Ethnic and Border Music. Fiona Ritchie and Doug Orr, Wayfaring Strangers: The Musical Voyage from Scotland and Ulster to Appalachia (University of North Carolina Press, 2014). Includes a forward by Dolly Parton and 20 track CD. Benjamin Filene, Romancing the Folk: Public Memory and American Roots Music (Chapel Hill and London: University of North Carolina Press, 2000) Rachel Clare Donaldson, "I Hear American Singing": Folk Music and National Identity (Philadelphia: Temple University Press, 2014) Kip Lornell, Exploring American Folk Music: Ethnic, Grassroots, and Regional Traditions in the United States (Jackson: University Press of Mississippi, 2012) Robert Santelli, American Roots Music--Based on the PBS Television Series (Abrams, 2001), foreward by Bonnie Raitt In 2004, NPR published the book titled The NPR Curious Listener's Guide to American Folk Music, Linda Ronstadt wrote the foreword. The Never-Ending Revival: Rounder Records and the Folk Alliance by Michael F. Scully (University of Illinois Press, 2008) In 2007, James P. Leary published Polkabilly: How the Goose Island Ramblers Redefined American Folk Music, which proposes a redefinition of traditional American folk music and identifies a new genre of music from the Upper Midwest known as Polkabilly, which blends ethnic music, old-time country music, and polka. The book was awarded the American Folklore Society’s Chicago Folklore Prize for the best book in the field of folklore scholarship. Nettl, Bruno. An Introduction to Folk Music in the United States. Rev. ed. Detroit, Mich.: Wayne State University Press, 1962. Film, TV, and Radio Hootenanny, a weekly musical variety show broadcast on the ABC network in the U.S. in 1963–1964, primarily featured folk musicians. The soundtrack of the 2000 film O Brother, Where Art Thou? is exclusively roots music, performed by Alison Krauss, The Fairfield Four, Emmylou Harris, Norman Blake and others. In 2001, PBS broadcast a 4-part documentary series, American Roots