Not a day goes by without hearing music, these days. Music helps us to ease the tensions in our life in contemporary society with various stresses. Many musicians hope to compose the songs that help people to be relaxed, to get them excited, or to move. Therefore, clarifying the relationships between music and the brain is important and useful. In our research, we
analyzed brain waves of subjects that were listening to harmony, one of the elements of modern music, and determined the correlation between listening to harmony and the relaxation index, as indicated by brain waves.