Fidelium was composed on behalf of the De Wilde family for H.M.V. 'Prins Bernhard' Emst and in memory of Wim de Wilde. The composition is based on 'Groot is Uw trouw' which was performed by 'Prins Bernhard' during the farewell service on Saturday 12 January 2019. Also, this was one of Wim de Wilde's favorite chorales. Fidelium means 'faithful' in Latin. It refers to honorary member Wim's fifty years of loyal commitment to 'his' 'Prince Bernhard'.