Why music gives you a chill

I always wandered why acoustical music gives me chill, specially on live concert.
Well looks like there's a chemo thing happening in the brain when you hear something familiar and comforting.

I just saw this article http://www.livescience.com/humanbiology/ mm_061120_music_chills.html that explains it.

Also saw a nice explanation on fox http://www.foxnews.com/story/0,2933,230818,00.html