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Iannis Xenakis composed Concret PH in 1958 at the studios of the Groupe de Recherches Musicales in Paris.

Concrèt PH used the sounds of burning charcoal as its source material, transformed through various tape machine manipulations. It was played as an interlude between presentations of Varese' Poème Electronique in the Philips Pavilion at the Brussels World's Fair in 1958.

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The photo at the left shows Iannis Xenakis working at the GRM studios, ca 1958.

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