It's always a tough one. When Granny's Attic sing "Does your mother know?", is that folk? When Ed Sheeran sings "The parting glass", is that folk? There used to be those who insisted that it had to be a traditional song, sung by a traditional singer. Fortunately we now seem to have a much broader church. While I do not believe that "anything goes", I am glad to see that mainstream performers, writers and media are seeing that folk music is indeed for the masses and not for an exclusive group of enthusiasts