A libretto is usually used for the audience to understand and follow the text of an extended musical work such as an opera or musical for example. Over the course of history, the libretto has often had a secondary role: It's text was to adapt and follow musical movements at all time. - "réciproque" votes for a liberation and emancipation of the libretto and allocates an autonomous role to it. While the audience are listening to an acousmatic piece, they are holding a libretto in their hands being pointed to turn the pages by the voice in the piece. They are confronted with questions that undermine the authority of sound over text and statements that question the reality of listening.