There is literature extensive on the benefits of the music therapy in the adolescence, and more specifically, in young with any difficulty social. The objectives of this study exploratory were: a) investigate if it participation in sessions group of music therapy modified them relations existing in the groups global; (b) identify improvements in the elections that were between the students participating in the research, differentiating to them students of the group control of the group experimental. Twenty-four students (17 men and 7 women) 3rd and 4 th of that of the programme of Diversificacion Curricular from a school in Madrid, divided each level in a group control and one experimental participated. Data were collected through a sociogram. As regards the results there were changes in relation to them sociograms from the pre to the post-test in their relations in group. The authors discussed on if them implications of the study could serve to improve them relations social between teenagers in them institutes, and if would be positive the introduction of the music therapy in them schools as helps therapeutic. After the study, it is shown statistically significant that the relationships between the participants of the experimental group are modified.