The Sensory Cortex- The part of the brain that contains tactile feedback from playing an instrument or dancing.

In violinists the part of the Sensory Cortex that deals with the actions of the left hand (the hand that plays the notes) is larger than the part that deals with the right hand (or in other words the bow arm). And in general, the Sensory Cortex is larger in violinists than in other people.