We differ, Mooman. But, as you say, peace.
I think "world" is a great word to describe wgat we are all standing on. "Music" is a great word to describe all kinds of music. "Folk music" is a great phrase to describe folk music, whether in Europe, Africa or America. And probably Alpha Centauri too, for all I know: they probably need village wedding bands there too.
   Certainly, some kinds of music are unclassifiable. Folk music, though, is fairly easily classifiable, as are Viennese waltzes, oompah bands, vintage rock'n'roll and Gregorian chants.
    But, to return to "House of the Rising Sun".......