The Cardiff Singer of the World may or may not be (as several of this year’s competitors seemed to think) the most important voice competition in the universe, but it must surely be the nicest. The Welsh really do believe, perhaps rightly, that they invented singing; and to hear the whole St David’s Hall uplifted in “Land of My Fathers” at the end of Sunday’s final was a heartwarming experience – almost as much as to see the four losing finalists applauding the winner, the Moldovan soprano Valentina Naforniţă, as if they were honestly pleased she’d won, though at least two of them must have been bitterly disappointed.