The Kloosterkerk is a church on the Lange Voorhout in The Hague, Netherlands. The church and its accompanying monastery were first built in 1397. The church is known today as the church where Beatrix of the Netherlands occasionally attended services.

Marcussen & Søn, also known as Marcussen and previously as Marcussen & Reuter, is a Danish firm of pipe organ builders. They were one of the first firms to go back to classical organ-building techniques, and have been producing mechanical-action organs since 1930. Aside from their many instruments in Denmark, they have built organs in northern Germany, Sweden, Finland, the Netherlands, Great Britain, South Africa, Japan, and the United States.