This paper shows the results of an experiment consisting of a sequence of didactic activities carried out with students of first grade of Musical Language of Professional Conservatory Education through the artistic picture as main tool for the historical and musical contextualization and to support musical audition and interpretation. On this occasion, the central panel of the altarpiece of the Coronation of the Virgin from the parochial church of Retascón (Zaragoza), made in the first third of the fifteen century by the Master of Retascón, which includes singing angels with music sheet rolls / music scrolls, is the medium through which the different learning activities are going to be developed. In addition, an unpublished iconographic-musical description of the selected work is provided. With the aim of reaching some specific learning objects related to Medieval and modal music, apart from the particular methodologies of artistic and musical education, the quantitative method is used. Its results confirm the usefulness of the artistic picture in Musical Language learning.