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This might be a bit late, but the Koningsdam and the upcoming Nieuw Statendam have beautiful venues called the "queens room" much like on Cunard. They have a house band that plays all sorts of ballroom music. It's nice to hear that someone at Holland America heard people complaining when they said they'd take away ballroom dancing from their cruises. The dance group I go with is going on the Nieuw Statendam in April of 2019.