Surgery Fine-Tunes Legendary Banjo Player's Brain

"I knew when he found the sweet spot," Adcock said. "That was it."

Bluegrass banjo playing legend Eddie Adcock regained control of tremoring hands after an incredible invasive brain surgery.

(ABC News)

At a follow-up appointment, Neimat demonstrated how the electrode worked, before and after. Before the electrode was activated, Adcock could not draw a spiral and plucked clumsily at the banjo.

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But with the push of a button and a shock of energy, the bluegrass legend was banging out a fast-paced blues rhythm.

Just hours later, Adcock hit the stage again to rejoin his wife, who plays bluegrass guitar, to recreate their unique sound.

"I am so blessed," Adcock said. "This is the best thing that has happened to me in my life."