The Greek word "mousa," meaning muse, the spirit-source of genius or inspiration, is the etymological root of "music." Centuries ago, two of the great Greek philosophers, Socrates and Plato, gained distinction as musicians and regarded the art of music as indispensable to the health of the soul. Plato believed that musical training was a more potent instrument than any other in the integration of the human being.It seems that the healing power of music, over body and spirit, is only just starting to be understood, even though music therapy is not new...