In the article, the author dwells on the problem of future vocalist's emotional expressiveness formation as one of the main factors of his professional and vocal training. Based on the theoretical analysis of psychological, pedagogical, art and vocal pedagogical literature we highlighted scientific approaches and principles determining the formation of the emotional expressiveness, its quality, and effectiveness. Scientific approaches and principles will become the background for the methodological model of future vocalist's emotional expressiveness formation at solo singing classes. Keywords: scientific principles; scientific approaches; emotional expressiveness; professional training; future vocalist.