The article presents the outlines of the research and the conclusions based on the author’s PhD dissertation. It touches upon the influence of music therapy techniques on the improvement of a development of autistic children, especially in terms of communication as well as their social, cognitive, emotional and behavioral development. The researcher presents and compares two undirective methods: Music therapy and Growth through Play System (GPS). Among many therapeutic applications of music, the most significant ones are chosen and analysed: improvisation, re-creation, composition and listening associated with musical relaxation. The results are presented in the form of an evaluation which therapy is the most beneficial for autistic children and their holistic development.