Laura, my friend who married a Belgian and now lives in this classic home along with her two small children, is a musician.
And, Brussels held many free concerts in their plazas.
Laura also recommended this Music Museum that displayed musical intstruments throughout the ages and from different cultures. They gave us headphones that played music from the instruments. It was lovely, and the musuem itself was done in Art Nouveau--the style of the city.
Oh, and we tried lots of beer.