‘Music of the folk’ first considers the prominence of folk music in Hungary and the composers Béla Bartók and Zoltan Kodaly. How folk songs and folk music became world music is then discussed along with the folk roots and worldwide proliferation of Celtic music. American folk music is examined through the African-American folk musician, Huddie Ledbetter, who was general known as Leadbelly, and the Lomax family of folk musician scholars. John Avery Lomax, Alan Lomax, and Beth Lomax Hawes all played a particularly dominant role in the collection, publication, and dissemination of American folk music. Finally, the spread of the polka dance across the world is described.