Since our bodies and everything else in the universe are vibrational in nature, the music that we listen to should be in harmony with our frequencies. When the music is NOT tuned to the cosmic frequencies that we are living in and adjusted to, it may induce weakening of our bodies and leading to disease.
The cosmos is based on a tone of A=432, NOT the A=440 Hz that we use in western music. If we go to ancient music and music that is still used by monks and some healers, we also find they use the A=432.
Jamie Buturff at https://www.spiritualresults.com has done a lot of research on this.
So all you musicians out there have to retune your instruments. You could be instrumental in helping the world heal!