"Research is showing that our brains understand music not only as emotional diversion, but also as a form of motion and activity. The same areas of the brain that activate when we swing a golf club or sign our name also engage when we hear expressive moments in music. Brain regions associated with empathy are activated, too, even for listeners who are not musicians.
And what really communicates emotion may not be melody or rhythm, but moments when musicians make subtle changes to the those musical patterns."
New York Times, April 18, 2011