In this research, supported by the Swiss National Science Foundation (snsf), the teaching practices of instrumental and vocal didacticians are analyzed from several points of view. At first, these teaching practices give us information about the evolution of forming devices that concern didactic professors in Higher Music Schools. But they also bring to light the type(s) of vocational training followed by the student teachers. In this paper, we present: the research methodology (quantitative and qualitative), the professional models that underpin the teaching practices, the double function of embodiment (as a tool to teach an instrument or to sing, as a subject to study), The variety of roles a didactician has to put on.