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Denise Bacon, 65, of East Sussex, England, got a diagnosis of Parkinson’s disease in 2014. The condition affected her ability to walk, swim, dance and play the clarinet. Doctors at London’s King’s College Hospital recently revealed that Bacon underwent deep brain stimulation in July — and played her clarinet during the procedure. As she played, doctors stimulated her brain, one electrode at a time. Neurosurgeon Keyoumars Ashkan said the effects could be seen immediately. As the right side of her brain was stimulated, he said, her left fingers were “flying,” while her right-hand fingers were “stiff and slow and couldn’t move.”