The Two Sides of Music

The Two Sides of Music
Jack H. David Jr.

The human brain is very complex in the way it perceives information that it receives through sensory input. The two cerebral hemispheres perform different functions; the left hemisphere processes information that requires analysis or some type of language to comprehend, and the right hemisphere deals with the symbolic, non-verbal and emotional portion of what we call reality. If we have to "think" about something, we are using our left hemisphere, but if we simply act by "instinct", we are using our right hemisphere. The human experience of emotion is also a function of the right hemisphere. 

http://jackhdavid.thehouseofdavid.com/papers/brain.html