Violinist plays violin during his brain surgery

Roger Frisch is a world renowned violinist so when he developed a tremor in his hand that was making it difficult for him to play, he contacted the Mayo Clinic, where it was determined that surgery would be the best chance he had to get rid of the shakes.

Roger went under the knife and had electrodes inserted deep in his Thalamus. The electrodes were supposed to stimulate the area of the brain that was causing the shakes with different frequencies, hopefully eliminating them.
The only way to find the area of Roger’s brain responsible for the shakes however, was to keep him awake and have him play a violin as the doctors inserted the electrodes.  (OUCH)

The surgery was a success, Roger can continue playing his violin as long as he sets a pacemaker controlling the electrodes.