This article offers an approach to the postulates of Philippe Perrenoud, who proposes a review of the formative evaluation, which is the framework for this work. A descriptive exercise is carried out of the evaluation instruments used in the History of Music I course studied in the professional degree offered at the Tolima Conservatory, in order to then make an experience about the formative evaluation of Perrenoud over an eight week period. As the experience is described, observations are made to the students, including assessment tools, reflections, criticisms and comments such as the student’s disposition towards an instrument, the incorporation of creativity as an evaluable element, the attitudinal change of the students, among others. Finally the conclusions are made regarding the contributions, the pros and cons of the subject’s formative evaluation, the changes registered by the students, as well as the commitment and effort which also involves the teacher.