folk music 
noun [mass noun]
Music that originates in traditional popular culture or that is written in such a style. Folk music is typically of unknown authorship and is transmitted orally from generation to generation.There are no simple explanations for the remarkable transformation of Celtic music from folk music to world music....
- And these different genres, like folk music and dance music, come out of that.
- I have never owned or been interested in folk music, except Woody Guthrie, who transcends it.