Musical Therapy

Music is a very big part of our lives. We listen to it when we work, when in a religious setting, music is even used in medical situations such as surgery. Music is everywhere. There are even medical roles specific to music, such as musical therapists. However, does music affect human mental and/or physical health? Surely if there is a medical opening titled "musical therapist", it must have some amount of positive affect on people's health. Music does in fact affect our health, in very positive and surprising ways. Though, in what ways?

Considering that there is a medical profession titled "musical therapist", that indicates that there must me an effect on the mind brought by music.