Perfect pitch?

In a local duo, "Nancy Moran and Fett", Fett (he must have a real name) had perfect pitch. He could reach over in the middle of a song and adjust Nancy's guitar (while she was playing it) when it was ever so slightly out of tune. Just a little twist of a tuner and he was done. I'm not sure how Nancy could stand it. They have since moved to Nashville.

Roger in Baltimore