Nice video from Scientific American discussing how the human brain reacts to music:
While listening to music, you might find yourself tapping your foot or bobbing your head to the beat. What you might not have expected is that as you listen to your favorite tune, the rhythms in your brain also follow along.
Brain rhythms arise when large groups of neurons fire together. Previous studies have shown that listening to someone talk can elicit such activity. Now research reveals that brain rhythms also synchronize with musical sequences. And musical training can enhance this ability. The study is in the Proceedings of the National Academy of Sciences [Keith B. Doelling and David Poeppel, Cortical entrainment to music and its modulation by expertise].