|"Is this all real? Or has this been happening inside my head?"
The subject of this article is of a real-life person, place, group, company, product, or creative work that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
Notable residents include the Muggle J. C. M. van Riemsdijk, who wrote a book on the history of Dutch music entitled Het Stads-muziekcollegie te Utrecht (Collegium musicum ultrajectinum): Eene Bydrage tot de Geschiedenis der Toonkunst in Nederland.