Musicians and music scholars have only known about the music collection of the Arenberg family's private archives at Enghien, which is remarkable both for its quality and the quantity, since the last decade of the 20th century. 

Research in this collection by the musicologist Marie Cornaz has resulted in the production of two catalogues, which were published in the 1995 and 2004 volumes of the Revue belge de Musicologie (Belgian Musicology review). The two catalogues reveal that this is one of the richest private collections in Belgium, forming an exceptional international musical heritage of almost one thousand five hundred pieces.