Besides much printed material of operas, operettas, oratorios and cantatas from the classical repertoire, there are also unique pieces within these genres to be found in BOO, such as the opera
La Route d'émeraude by August De Boeck, the oratorio
Icare by Marcel Poot, the operetta
Seppel by Emiel Hullebroeck or the chamber opera for television
Debat de Folie et d'Amour - in Dutch
Het geding van Minnegod en Zotheid - by David van de Woestijne.
This sub-collection is still largely unknown territory and will hopefully be made accessible in the coming years.