The author describes the early years of electroacoustic music in Chile, one of the pioneering countries in South America where electroacoustic music activities already started in the mid-fifties.
Claro talks about the Taller Experimental de Sonido (Experimental Sound Workshop) activies in 1957, including some rudimentary sound classification experiences.
He also discusses the early pieces by León Schidlowsky (Nacimiento, 1956), Juan Amenábar (Los Peces, 1957), José Vicente Asuar (Variaciones Espectrales, 1959) and, very briefly, his own work (Estudio No. 1, 1960).