Music therapy should not just be an idea anymore but one’s need to immerse oneself every day in the benefits of music. Music therapy consists of various methods and ways of operating. It has been proven that it can be applied not only to people in need of help but also to healthy people. Music therapy is effective when working with people who have various disabilities, and it is also highly effective in working with children who have attention deficit hyperactivity disorder (ADHD). Children with ADHD are highly restless, impulsive, and hyperactive so it is therefore important to choose the appropriate musical content based on their ADHD degree and age, and to choose the appropriate working method to attract motivation and interest in a child. Music therapy is most effective in easing restlessness, expressing emotions, and getting to know one’s feelings when applied to children with ADHD. Research results of the application of music therapy suggest that it has great influence on general functioning, quality of life, and emotional control. The aim of this thesis is to create an insight into what is music therapy, to show how exactly it works, what the ways of operating are, the principles behind it, and the impact of it on children with ADHD. Additionally, it aims to give an overview on ADHD, its origins, causes and symptoms, and to provide an answer to what is ADHD and what it is not.