Concret PH (1958) is a musique concrète piece by Iannis Xenakis, originally created for the Philips Pavilion (designed by Xenakis as Le Corbusier's assistant) at the Expo 58 and heard as audiences entered and exited the building (PH = paraboloïdes hyperboliques, concret = reinforced concrete/musique concrète). Edgard Varèse's Poème électronique was played once they were inside the building.
