Concert· Enschede
Cantus Firmus Belgica
I don't have reliable information about a specific event called "Cantus Firmus Belgica," so I can't summarize it with confidence. Based on the name, it appears to be related to a musical theme or composition in Belgium ("Cantus Firmus" is a musical term for a fixed melody, often used in choral or polyphonic works, and "Belgica" refers to Belgium or the Low Countries) — but I'd rather not guess at