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 1958 Brussels World's Fair (Expo 58) and heard as audiences entered and exited the building (PH = paraboloïdes hyperboliques, concret = reinforced concrete/musique concrète).
The only sound source is burning charcoal, cut into one-second fragments,[1] with numerous transpositions and overdubs, a granular texture from which Xenakis creates a continuum.
Most of the musique concrète which had been produced up to the time of "Concret PH" is full of many abrupt changes and juxtaposed sections without transitions.
I seek extremely rich sound (many high overtones) that have a long duration, yet with much internal change and variety.
There is usually no electronic alteration of the original sound, since an operation such as filtering diminished the richness.This article about a classical composition is a stub.