Did you read the Family Weekly article several issues back, regarding those enhanced brain-pathways of not only musicians, but also of those like us who often hear music? Brain autopsies have proven that the internal "brain-cables" connecting between the cortex's are significantly/measurably enhanced within those such as ourselves. Wish I had saved the article - reason enough to listen to music, regardless of the additional benefits.
Interesting article on musician's brain waves...
In my studies of neuropsychology, I've come across many references to the fact that musician's tend to have musically related brain function lateralized differently than the rest of us. Here's an article (from CNN) about another potential difference.
http://www.cnn.com/2001/HEALTH/11/15/musicians.brains.ap/index.html
http://www.cnn.com/2001/HEALTH/11/15/musicians.brains.ap/index.html