De Wilhelmus

"De Wilhelmus" (pronounced [də vilˈhælmus]; Luxembourgish for "The Wilhelmus") is the grand ducal anthem of Luxembourg. Lyrics for it were written in 1919 by Luxembourgish writer Nik Welter, although they are not often used in official performances. The anthem is performed whenever a member of the Grand Ducal Family enters or leaves an official ceremony, while the national anthem, "Ons Heemecht", is performed at national celebrations. The anthem can be and also was known by just "Wilhelmus" or "Wilhelmuslid" (The Wilhelmus song), but it has become custom to always write it with the Luxembourgish article "De", and the anthem of the Netherlands is generally written without the article or with the Dutch article "Het" in order to distinguish between the 2.