The study of jazz opens to observations of legitimacy limits between the world of scholarly music, of which it imitates the organization, and that of popular music, with its star system. The changes taking place in the jazz market in France in the 21st century are seen through the awards system in different competitions. After observations, the image of the jazz lover as a bourgeois and scholar intellectual crumbles. Democratization and mediation now lead us to consider users, neophytes and experts alternativly as receivers, broadcasters and producers of jazzistic information.