Stephen Williams introduces operatic gramophone records chosen by Norman Allin , John BarBirolli , Charles B. Cochran , John Gielgud , Robert Heipmann , Jack Hylton , Sandy Macpherson , C. H. Middleton. J. B. Morton (' Beachcomber '), J. B. Priestley-and a letter from Bernard Shaw , explaining why he wouldn't choose a record