... whereas in your ideology (as far as I understand it from your previous posts), all English people should be playing the same English musical instruments, singing the same style of folk songs and hymns, dancing the same English dances, only visiting other nation's cultures as an onlooker.

Just because cultures mix, doesnt necessarily mean that any culture is lost, quite the opposite happens in fact, cultures become enriched, new and exciting music, dance and art comes into being.

We should all celebrate what is local to us, but traditions change and evolve. Traditions that dont evolve often die out.