Ah, the sound of laughter, music to the comedian's ear. Few jokesters ever heard more of this music than the tandem of Bud Abbott and Lou Costello. Outrageously popular on stage, in film, TV and especially on the radio, this, the original odd couple, dominated sketch comedy for years. They never brought their private difficulties, which were many, into public view, sparing their fans the drama and sorrows of their own lives. Too bad this ethos is long lost in Hollywood.