You may ask: "What kind of music can heal man? Is it singing, or playing, or something in the way of dance?" Singing is the most powerful, for singing is living. It is prana, it is life itself, it is voice. No doubt it is also life which is working through an instrument by the touch, but in singing it is direct life, the breath touching the heart of the listener. But what must be behind this voice? There must be a heart prepared with the help of the battery that it needs. What is that battery? That battery is what we call love and sympathy - the greatest power there is.