Show Business: Man with the Golden Ear

Ten years ago, a couple of boys from The Bronx named Walden Cassotto and Donald Kirshner got into the music game writing radio-commercial jingles. They never made a living at it, but Cassotto contrived to change his name and his luck by going into singing: he is now that ever-lovin' smash, Bobby Darin. Kirshner still has the same moniker, but in what passes for the pop-music business these days, he is far more formidable than Darin. At 32, he is president of the music division of Columbia Pictures-Screen Gems TV, the hottest publisher in...