"Musique Concrete with vocalizations by Francois Dufrene" "This is one of Henry's lesser known works, in which he combines two compositions simultaneously. La Noire was created in 1961 using "sounds concrete"; Granulometrie was created the following year using atavistic vocalizations from the sound poet Francois Dufrene. Henry decided to combine them late in 1969. The vocal parts are transformed and re-orchestrated. The result, produced in the special Paris based Studio Apsome designed for experimental music, is very interesting." - YouTube poster.