Although this historical article concerns, for the most part, Varèse’s thoughts on the liberation of sound in an orchestral context (the tempered system), it does contain a section concerning the electronic medium in which Varèse discusses how this medium offers composers almost endless possibilities of musical expression.
All references of the same author:
(English)Varèse, Edgard (1983). 1953-1965 : Invention du futur
(Français)Varèse, Edgard (1983). 1953-1965 : Invention du futur