Why do we enjoy listening to music ?


My son posed a great question.
Why do we enjoy listening to music? Why does music do to us chemically, psychologically, physiologically etc.

Anyone know of any interesting articles , web sites etc.

Thanks!
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THIS IS YOUR BRAIN ON MUSIC, by Daniel J. Levitin

http://www.salon.com/books/review/2006/09/05/levitin/

From an ad on an audio magazine not too long ago:

"Music is what life wants to be".
It evokes or releases intense emotions that our structured and mannered lives don't always allow us to feel. Just why our brain decodes certain sounds as elation, despair, melancholy is something I don't know, and maybe that book explains it.