Varèse is considered, by many, a grandfather of electronic music, someone dedicated to the possibilities of music made with audio signals and loud speakers even before such means existed.
This piece–composed and connection with the 1958 Brussels World Fair for the experimental Philips Pavilion designed by fames architect Le Corbusier–is one fulfillment of those early ideas.
Here, too, is a link to the Virtual Electronic Poem (VEP) including the research done to reconstruct the original, lost work.
Video and audio below (original video loosely combined with music):