 Although Ann Blyth (qv) had done her own singing in most of her  other movie roles, her trained soprano voice was judged too operatic  for the role of Helen Morgan (I) (qv) and pop singer  Gogi Grant (qv)s voice was dubbed in. Ironically, the real Helen  Morgans light, high soprano voice was actually closer to Blyths in  quality than it was to Grants.