"I want to change the consciousness of my fellow human beings. To achieve this purpose, I must use the acoustic means of our time." Delivered in 1975, these Luigi Nono's words perfectly summarize the approach of a composer who defined himself as a "musician-activist" deliberately choosing not to make any difference between music and politics. For Nono, changing the consciousness of others, via his music, means changing their perception of the world by applying himself to bring out the "infinite possibilities" of the sound.This thesis tries to show intrinsic relationship between writing forms and political dimension in Luigi Nono’s works. So this contribution will endeavour to explore how the composer exerted himself through his music – particularly thanks to auditive perception – to link up with what he tried to do as a communist militant: widen, alter, multiply the world, make it open out all possibilities, make it fairer too, and arise new utopias from the experimental laboratory of his compositions.This work is built around biographical elements and fundamental texts of the composer which I try to make converse with a number of thinkers in the 20th century from Adorno to Merleau-Ponty, including Deleuze, Marcuse, Benjamin, Bloch or still Bachelard. It mainly leans on the Venetian’s compositions of which I propose the most complete panorama as possible, particularly focused on some chosen works: chronologically Due espressioni (1953); Liebeslied (1954); Canti di vita e d’amore (1962); La Fabbrica illuminata (1964); Como una ola de fuerza y luz (1971); …sofferte onde serene… (1976); Fragmente-Stille, an Diotima (1979-1980); Das atmende Klarsein (1981); ¿Dónde estás hermano? (1982); Prometeo (1981-1985), by the relation they have each other with the three themes that I develop: perception, otherness and utopia.