Why Sound Heals

We can feel it when we turn on the radio and our favorite song happens to be playing, or when we sit quietly and listen to the rain. There is a palpable peace when we are absorbed in quiet and a different kind of rejuvenation when we hear the wind in the trees. There is no doubt that sound has subtle, but profound effects on our body, minds and spirits. How exactly does sound work, though, to heal us?