Music is sound AND silence. It is the spaces BETWEEN the notes that create rhythm, melody, and meaning, and the greater the composer -- and the perfornance -- the better the quality of the silence. Legendary pianist Artur Schnabel said that it wasn't the notes but the silences between them he played better than other people. A few seconds more or less at crucial moments in the performance of a piece may mean the difference between a mundane and a transcendent experience.
In prayer we are neither on the one hand dialoguing with an outside source who utters messages from without, nor are we simply talking to ourselves. We are reaching deeply into ourselves and sensing more clearly that we are in God's knowledge and love. We are discovering the Divine within us. We are experiencing ourselves and our lives as uttered by God, and we listen.