Music belongs to no one. Music is international and it's up to the individual what they wish to listen to. As to the origins of traditional folk music, does it really matter as long as you enjoy it ? For centuries The English, Scottish, Welsh and Irish have produced some great music. I have listened to local folk music in a lot of European countries and admired their skills and passion, didn't always understand it ! but enjoyed it.
Glad to Sense Prevail on this thread, don't provide the oxygen. A better man walks away.