Music to Aid Healing

I was wondering can Music be used to aid healing, I'm not talking about the lyrics here but more the chords, the way they are molded together.
Music definitely can change your mood, they say it's food for the soul.
So in cases of trauma when the mind and spirit need to be healed as well as the physical body can music help?

This may already be in practice, music is used to help people who suffer from Alzheimer's and also in aiding coma patients

One song that moves me is The Great Gig In The Sky by Pink Floyd. strange but true ;-)