Iannis Xenakis (1922-2011), was a Greek/French composer, architect and engineer and a pioneer in the use of mathematical models in music and applied stochastic processes. Xenakis has been an important influence on the development of electronic and computer music. He composed music for pre-existing spaces, integrating music into architecture.
The Philips Pavilion was designed by Xenakis and Le Corbusier for the World’s Fair “Expo ’58” in Brussels, where Edgar Varèse’s ‘Poème électronique’ was performed. Xenakis planned the pavilion with the help of hyperbolic curves, which he had alread used for his first composition Metastaseis (1965-54, for orchestra, 61 instruments) and the principle of the Modulor by Le Corbusier and the golden section.
Sources:
Collection famille Xenakis DR
Iannis Xenakis, Musiques Formelles, 1963 (engl.: Formalized Music: Thought and Mathematics in Composition, 1971)