From News Of The Weird:

Legendary banjo player Eddie Adcock, age 70 and suffering hand tremors that failed to respond to medication, volunteered for a revolutionary neurosurgery in August in which he finger-picked tunes while his brain was exposed, and Vanderbilt University Medical Center surgeons tried to locate the defective area. In "deep brain stimulation," doctors find a poorly responding site and use electrodes to arouse it properly. As Adcock, conscious but pain-free, picked out melodies, doctors probed until suddenly Adcock's playing became disjointed, and electrodes were assigned to that spot. By October, according to an ABC News report, Adcock, with a button-activated chest pacemaker wired to his head, was back on stage, as quick-fingered as ever. [ABC News, 10-3-08; The Bluegrass Blog, 9-9-08]

Pretty cool, eh?