An old movie is flickering across a television screen late at night. Mickey Rooney is cuddling up to Judy Garland, a banjo on his knee. He strums the opening to "Swanee," hitting a few fancy licks. Certainly that can't be Rooney playing the banjo. Who is it, really? None other than Eddie Peabody, one of the few on this instrument who can make a serious claim to being the most famous banjo player of all time. No, that would be Earl Scruggs, some listeners who like to wallow in bluegrass might object. Or Bela Fleck, younger banjo fans would argue. It is surely true that the fing...