The meditative and healing power of music is confirmed by research in various countries. As the story goes, in biblical times, David played the harp effectively to drive away ominous spirits from King Saul. In 400 BC, Hippocrates, the Greek pioneer of medicine, used music to improve the emotional condition of his patients. In the 13th century, there were provisions for playing music in hospitals in the Arab world to help patients recover from illnesses.