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Concret PH ''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) 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. At 2 1/2 minutes long and focused primarily on density, ''Concret PH'' was created in the Philips office in Paris (Varèse having exclusive access to the studio with spatialization capabilities established in Eindhoven) or at the Groupe de Recherches Musicales. The only sound source is burning charcoal, cut into one-second fragments,〔Roads, Curtis (2004). ''Microsound'', p. 64–65. ISBN 9780262681544.〕 with numerous transpositions and overdubs, a granular texture from which Xenakis creates a continuum. Using slight manipulation, the main techniques where splicing, tape speed change, and mixing.〔 The piece was composed intuitively, rather than being guided by mathematical processes.〔 In the Philips Pavilion, it was projected over 425 loudspeakers through an 11-channel sound system. Xenakis described the effect as "lines of sound moving in complex paths from point to point in space, like needles darting from everywhere."〔Rowell, Lewis (1985). ''Thinking About Music: An Introduction to the Philosophy of Music'', p. 241. ISBN 9780870234613.〕 ==Sources==
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