To explain the role of the audience, I would have to compare the master class itself to an experiment: The vocalist being the independent variable, the instruction of the master class clinician being the dependent variable. Although the clinician actively gives instruction as a scientist applies the dependent variable to the independent variable, the audience is full of scientists as well. The audience assesses the information given by the experiment. After an experiment is completed, the scientists usually assessed the data gained from the experiment to see if the experiment itself supported or denied the hypothesis. Likewise, the clinician hypothesizes and creates dependent variables for the independent variable (the singer) to react to.
