Here's a totally fascinating article with the latest research on music and the brain:
(Or go to www.aldaily.com and click on "more" under "Think of any piece of music" ,third article in the next to left column.)
It shows how complex and all-involving our response to music is. The ability to recognize and recall melodies, for instance, is totally separate from the emotional thrills (or chills) we get from particular pieces.
Amazingly, we hear consonant sounds in the pleasure/reward area of our brains, and dissonant sounds in a completely different area (the "I am in hell" area, no doubt, LOL )
Musicians' brains really are different (as anyone who has read Styxx's posts can attest ). Learning music dramatically enlarges and remaps both the tonal and finger "maps" we have in our brains. And for musicians, music activates the same reward systems as for food, , and addictive drugs. But we knew that already, didn't we?