This thesis is about the research on the impact of listening to classical music on children in the early years of development and preschool children, the influence of music on the emotional, social, motoric and cognitive development and how children react to classical music. In this research various classical pieces of music were used which stimulate different emotions and reactions: joy/happiness, unhappiness/gloominess, relaxation, the need for movement and dance. The results of the research show that by choosing specific music pieces we can provoke specific reactions in children and excite different feelings, stimulate them for movement and for better communication and collaboration with peers. It is interesting to note that children felt more frequently the feelings of joy and happiness. The need for movement was present during the listening of each composition. The cognitive attention which was tested in the research through the recognition of the tempo and the instruments present in the composition was very visible (high). The results show that classical music has a positive, permanent and visible impact on children's development. Therefore, classical music enriches the children not only in their early years of development but throughout their whole life.