Popular in jazz clubs in the late 90s, the vocal jam opens the stage to those amateurs who want to sing in public. In a same festive atmosphere, amateur singers and jazz professionals meet curious tourists and admiring friends, regular night birds, and jazz enthusiasts. For a night, the jazz club becomes an original place of urban sociabilities where one expresses oneself, one's taste for fun, and one's pleasure of meeting people. Singers, musicians, and professional schedulers—or hoping to become so— transform this space into a place of professionalization by facilitating the insertion of these newcomers on a closed saturated and competitive labor market.