We live in the world of vibration. Everything which exists around us is vibration, and those vibrations are affecting us - even when we can't perceive it, a particular vibration can affect a person's physiology and psychology.

Sound is vibration and we are surrounded by various different sounds - and knowingly or unknowingly they have a certain effect on us. Some sounds have a positive effect and some not so much. So it is the sound itself which is creating a positive, less positive, or negative effect on us. This is the principle behind Mantra science and how Mantra (= a certain sattvic sound) can go so much deeper in our system and help us at different levels.

Our cells are able to listen; then, if we subject our cells to a sound of a certain quality, definitely the cells' health will be enhanced, keeping the body/mind mechanism in tune.

Ayurveda is also connected to this aspect of Sound, as it is one of the first and only medical practices which went all the way down to the roots, as a lot of issues that appear in the body, have the roots in the mind. So ayurveda would treat the problem at the level of the mind, if the root was found there, and then consequently heal the physical plane. And one of the key tools used in Ayurveda is sound, because where the medicine cannot reach, the Sound can reach.