A major turning-point in the sonic oeuvre of Eliane Radigue. Finished in 1970, it was the last work composed with feedback materials. From that experimental period, Opus 17 preserves a plastic character: a music made of rough sonic phenomena, at once harsh and granular, possessing a quality of materiality and tactility. Its vibrations structure the air surrounding the listener with densities, thicknesses, indeed with palpable movement. Her compositions are frames which let us hear these phenomena, open frameworks from the sonic installations of her Endless Musics and here reinserted in the five scenes making up Opus 17. In 1970, in her studio of very rudimentary means, she developed a completely unique body of work centered on sounds produced by feedback. Opus 17 has the quality of showing off the sum of the achieved techniques and methods.