*Bilingual English/French* In a 1955 pamphlet entitled Seven Years of Musique Concrète, Jacques Poullin wrote: "[...] sound projection in a concert hall is a logical extension of the concerns of the Groupe de Recherches de Musique Concrète and requires its technicians to properly study multiple aspects of the problems of sonorisation that are often neglected and to date have been almost exclusively the preserve of 'public address' technicians".

From the very beginning, fixed media electroacoustic music in its various guises faced a significant challenge: that of how it could be shared with the public. Even before it was distributed in the form of records, musique concrète, having first been transmitted on radio, soon turned to the concert stage. From the time of its birth, a twofold question was posed: What strategy of diffusion could be used for this music which involves no live performers? But also, how could it make use of existing systems of sound amplification without losing its singular nature, making sure to preserve its own particularities? Identified very early on, these questions have lost none of their pertinence some seventy years later.

Under pressure from the cultural industries and faced with a largely commercially-driven standardisation of formats, it is important today to reaffirm both the singular nature of experimental electroacoustic practices, and the possibilities these practices open up beyond standards and rules. This calls for an exploration of the vast domain of sound creation in which, here and there, ideas, concepts, and sometimes new works appear that fully embrace the question of the deployment of sound, its dissemination and its expansion. An exploration focussed on the listening experience—a fundamentally musical experience—but adopting a critical approach which may sometimes call into question traditional ways of sharing and listening to sound, the status of listener and creator, and which may even challenge the acoustic integrity of venues and the legitimacy of diffusion systems.

Such are the questions to be addressed here. Sketching out the contours of what is quite obviously a huge subject, this volume, drawing upon a wide variety of points of view, experiences, and ideas, hints at an entire critical apparatus that remains to be developed and consolidated, but is crucial given the primordial importance of the theme of dissemination. For dissemination is the transitional stage par excellence, the uncertain stage that sits between creation and reception while at the same time determining both. It is a critical stage, yet one that is often neglected or, as Poullin says, left to a technical intermediary who may impose conditions entirely exogenous to questions of music and listening.

For these reasons, it seems more necessary than ever to return to the experience of sounds, to once again listen attentively to their trajectories, their diffraction in space, their emergence and their disappearance. To get to grips with the mysteries of their deployment so as to reaffirm that this deployment is essential to them.