One of the first works produced there was Goeyvaerts's Nr. 5 with Pure Tones, which Stockhausen helped his friend to realize.
Karel Gott | Karel Čapek | Karel Appel | Karel Teige | Karel Reisz | Karel Goeyvaerts | Karel van Mander | Karel Václav Rais | Karel Husa | Karel Roden | Karel Kovařovic | Karel Halík | Jan Karel Lenstra | Karel Zeman | Karel van der Toorn | Karel Svoboda | Karel Štěpánek | Karel Píč | Karel Marquez | Karel Kryl | Karel Kroupa | Karel Jaromír Erben | Karel Zich | Karel Vasak | Karel van Wolferen | Karel Van Mander | Karel Stepanek | Karel Schulz | Karel Plicka | Karel Otčenášek |
He also was responsible for teaching the first generation of ondes Martenot performers, including Karel Goeyvaerts, Jeanne Loriod, Georges Savaria, Gilles Tremblay, and his sister Ginette Martenot.