Guy Reibel is one of the most enigmatic figures in the post-war electronic music scene. He started out with a double qualification: he first became an engineer - due to the pressure of his parents - and then studied composition with Olivier Messiaen in Paris, the teacher of Karlheinz Stockhausen, Iannis Xenakis, Francois Bayle, to name just a few. Pierre Schaeffer, the director of the GRM (Groupe de Recherches Musicales at Radio France), very soon offered him a position: he was not only responsible to edit and work out the famous 'Solfège' 3LP box that was the practical part of Schaeffer's theoretical manifest 'Trait Des Objets Musicaux', he also co-directed with Schaeffer the class for electroacoustic music at the National Music Conservatory. 'Douze Inventions...' is a milestone in electronic music and a perfect example for Reibel's musical austerity: very defined and limited musical material results in concentrated and dense forms. The unusually vital character of the music is also due to Reibel's use of hybrid sound production: he very often combined amplitude envelopes of acoustic sounds and noises (especially and very often of polysteron) on synthetic electronic sounds. This LP documents how Guy Reibel succeeded to compose a music that combines the density and purity of electronic music with an unbelievable sound sensuousness. A real listening experience, here released for the very first time! All music composed by Guy Reibel. Commissioned by ina-GRM, Groupe de Recherches Musicales, Radio France, 1979. Tracks 3, 6, 8, 11 played by TM+, Trio Instrumental Électroacoustique: Laurent Cuniot, Denis Dufour, Yann Geslin, recorded at Grand Auditorium, Maison de la Radio, Paris, May 7, 1979.