Perhaps if we are looking for the Capital of Folk..it should be where Folk music as we know it originated..but where is that???
All White American Folk music originated from England or the British Isles but we were invaded in long past history by Gauls/Saxons/vikings/other Norse tribes so where did the original singing come from......Best just forget it and enjoy what we have in our own areas....Here as Villan says....in Lincolnshire...we have real quality Folk music/songs.......I also think Mudcat would be a good capital!
Be Blessed.