The Medium - Muziektheater Transparant - 1997-04-01The Medium - Opera-Studio (van De Nederlandse Operastichting) - 1977-10-02The Medium - Stichting Operalab - 1989-10-01The Medium - Studio Ensemble Nederlandse Opera Stichting - 1966-05-02The Medium - Studio Ensemble Nederlandse Opera Stichting - 1985-04-04