Charley,
Styles have no copyright because they can't have copyright.
You cannot claim copyright on rumba-tango-beat4-beat16-reggae2 etc.......
The dutch copyright is one of the toughest worldwide and the organisation involved called BUMA/STEMRA confirmed this to me a couple of years ago when we had this discussion.
It's complete nonsens.
They would not have scared me off and I would be delighted to go to court with these assholes.
Following their claims you could in fact say that they are using worldwide recognisable standards and then claim that they are their's. Hence they breach copyright themselves.