If we compel the composer to write in terms of what the listener is able to hear, we flirt with the danger of freezing the evolution of musical language, whose progressive development comes about through transgressions of a given era's perceptual habits

All aspects of musical practice may be disengaged, and privileged, in order to give birth to new forms of variation: variations on the relationships between the composer and the performer, between the conductor and the performer, between the performers, between the performer and the listener, variations upon gestures, variations on silence that end in a mute music that is still music because it preserves still something of the musical totality of the tradition...all elements belonging to the total musical fact may be seperated and taken as a strategic variable of musical production. This autonomization serves as true musical experimentation: little by little, the individual variables that make up a total musical fact are brought to light. Any particular music then appears as one that has made a choice among these variables, and that has privileged a certain number of them. Under these conditions, musical analysis would have to begin by recognizing the strategic variables characteristic of a given musical system: musical invention and musical analysis lend each other mutual aid.