If you regard folk music as entirely narrative and words-based then that is in my view a very narrow definition. Jim said a fair few posts ago that English Language folk music was largely narrative, and this may be true, but it is not entirely narrative, and the folk music of, for instance, central and southern Europe is very different. There are more instrumentals, there is more dance. Even in England the Morris tradition is instrumental and dance based, would you not class that as folk? China and India have a large range of folk traditions, some of them sung, some instrumental, some dance. There is little discussion on this site of folk traditions other than Celtic and Anglo-Saxon, which is a pity.