Fascinated with the integration of noise into music., Henry studied with Olivier Messiaen at the Paris Conservatoire from 1938 to 1948 and for the next ten years he worked at Office de Radiodiffusion Télévision Française - The Studio d'Essai, later to become Club d'Essai, founded in 1942 by experimental ,electronic music pioneer Pierre Schaeffer, and it was in collaboration with Schaeffer that he wrote  the 1950 piece Symphonie pour un homme seul. He also composed the first musique concrète to appear in a commercial film, the 1952  short film Astrologie ou le miroir de la vie.  After leaving the prestigious RTF , Henry went on to create what was to be the first private electronic music studio in France , his own   Apsone-Cabasse Studio.

Henry, who died on July 4, 2017, aged 89, was acknowledged as one of the key figures in the development of elecrto-acoustic and electronic music and music-concrete.

Polyphonies (right) has been released as a 12 cd boxed set.

Perhaps this review from Mark 'R' on Amazon sums up  'Polyphonies', a 12CD compilation curated and remastered by the composer himself, and including nine previously unreleased pieces

'This is a wonderfully produced box set of some of the most incomprehensible music ever created. That's not a criticism, it was meant to challenge our notions of the form. And in that he succeeds. I have to say that I think you need to have listened to both 20th century "classical" music and 21st century progressive pop to really appreciate how Henry's manipulation of sound scape has become the way we now think about music. Over the 12 disks there are so many experiments with the notion of what sound can do that it is necessary to keep referring to the notes to have some explanation of just what is going on. But then again if you are going to take the journey into his liminal sonic space one disk just wouldn't suffice.'