Music is sound. Sound makes up a part of the total reality you endure, together with sight and smell. When you listen to music, your reality is suddenly harmonic, and since most of us absorb to some degree the reality we live in, harmony becomes a part of you.
Another thing is that to listen to music is using your brain "muscle", and it grows stronger as you use it, of course.
I am a musician. I play several instruments, and have done for as long as I can remember. Learning music, I discovered, was one thing. To learn techniqes and rules is all helpfull, but the most important thing music has taught me is to listen.
I am able to transfer my musical experience onto other areas, basically, because I have learned to listen, and not just with my ears, answers sometimes come as though an intuitive sense picked them up.
There are so many likenesses between a piece of music, any piece, and the game of life. After all, music is art. And art is a piece of heart (heART

)