Most of the european centers that were the essential and fertile ground for development of electronic and electro-acoustic music in the '50s and '60 were tightly connected to national radio networks. The Groupe de Recherche Musicales (GRM) of Pierre Schaeffer in Paris has been the nest of "musique concrete" in 1948, the Electronic Music Studio at the NWDR Koln (Nordwestdeutscher Rundfunk, born in ...