Trying to reduce the divide between culture and science, this article follows the producer of popular records, as an interface between music and its market. Like the innovator when he does not obey scientific, technical, and commercial reasons in succession, but reshapes them all together through a double task of giving its form to the product and the interesting people within it, the producer represents the public to the artist and the music to the media. First in a local scale, (...) then in larger and larger ones, alone with the singer, in the studio, and into the media, this sociology of the intermediary shows the producer experimentally organizing, as in a laboratory, a complete production-consumption cycle. Success is then not the mysterious leap to the public, but the last extension of an equation into which the public has been incorporated in many forms from the very beginning. (shrink)