This paper introduces the book of the theoretical texts by the composer Federico Incardona (Palermo, 1958-2006), collected and put in order by his students, now stored in the musicological library of Palermo University; it draws a concept map to guide the reader into Incardona\u2019s labyrinthine path. The fundamental concepts, highlighted and analyzed, are: the \u201cinaudito\u201d (what you never heard) as the result of a research in which the composer is involved even physically; the \u201csign\u201d, as a tool to objectify the unheard; the \u201ctone row\u201d as the order of notes obtained by their bonds with the sensations and experiences: the epiphany of the sound of things: the \u201ctradition\u201d as \u201cpermanent revolution\u201d, a R. Kolisch\u2019s idea that Incardona learned from H.-K. Metzger ; the \u201cwork\u201d as an utopian aspiration
