Here's a film in which Dick Raaijmakers talks about electronic music. He also mentions Karel Goeyvaerts and Karlheinz Stockhausen. Unfortunately, it is in Dutch:
http://www.youtube.com/watch?v=8ykZYy82eGsDick Raaijmakers worked as an assistant to Henk Badings and helped Edgard Varese when he was working on his
Poeme Electronique in Eindhoven. Raaijmakers is still regretting the fact that he didn't ask Varese to become his teacher. In the late 1990s the Dutch television and radio network VPRO made a film about Varese's activities in the Neterlands (I have it somewhere on a video tape) and for this film the images of the original Brussels performance of
Poeme Electronique were transformed into a short film. Here it is:
http://www.youtube.com/watch?v=rC3OXai7W9II will post more on Dutch composers later on. I'm very busy at the moment.