Interest in the study of emotions in education has grown in recent years. Some of our modern challenges, such as constantly adapting to new scenarios or the need for team work have justified the introduction of emotional competence into educational systems, while diverse studies confirm the relationship between music and emotional intelligence, so that the former could be used as a tool to develop the latter. The aim of this work was to examine the evidence for positive effects of music on the emotions of 3- to 12-year-old children, to which end a systematic review was carried out. Two reviewers independently evaluated 424 studies that were identified in MEDLINE, Psycinfo, and CINAHL databases, in order to determine whether they met the stated inclusion criteria. A total of 26 articles were selected for review. The results suggest several beneficial effects of music on children’s development, such as greater emotional intelligence, academic performance, and prosocial skills. It can therefore be concluded that music should be used in school settings, not only as an important subject in itself, but also as an educational tool within other subjects.