This volume collects two of Xenakis’ multi-channel works from the 1970s. Restored from the best quality source materials. A new high-resolution transfer was created from the original analog master tape for POLYTOPE DE CLUNY. HIBIKI HANA MA has been restored from the multi-track digital masters and was created for the Expo 1970 World’s Fair in Osaka, Japan, where it was experienced by thousands. It was designed to be played on a tape loop in a hall which boasted state-of-the-art acoustic equipment, with some 700 speakers scattered under the floor plus 128 surface and suspended speakers symmetrically distributed throughout the pavilion’s amphitheater. Both works were mixed for stereo by composer Gerard Pape, who worked with Xenakis and was the director of Xenakis’ CCMIX studio in Paris.