It pertains as a commercially valuable marketing concept, and therefore folks / folkies / even researchers believe that it represents a real genre of music and song (maybe even dance) that has its origins in prehistory. Quite how this can be actually proved is a moot point. But then if it helps to promote a long lost and forgotten culture (one that was never documented because it never actually existed), and if it makes money, then why not? The 'Invention of Tradition,' aka Hobsbawn, strikes again, and again, and ...