There are two issues being confused here by flakmongers who seem to hate the idea of there being an English (or more than one English) tradition.

Does it make sense for people to perform mostly within the tradition from which they come? Of course it does. Watch the pitiful attempts of most white musicians to perform blues reggae or African music. Can't you holy Joes HEAR the difference?

Do you not understand how scholars of music can say that certain nationalities of folk music use certain modes or scales? If you can understand that then you most be able to understand that a music can come from particular tradition.

You attack the above by criticising WAV's research.. That's a non-sequitur.