 Marilyn Horne, still blessed with a royal, marvellously unwearied voice despite her advancing years, sang one of Malcom's arias from "La donna del lago" with rock-solid control and the precision of a pianist.Deborah Voigt was not quite so impressive in her "Inflammatus", singing with "some grandeur if little variety", but things looked up when Frederica von Stade presented an aria from "La Cenerentola" "with generous spirit and a winning smile".Rockwell Blake sang "runs "prestissimo" and high Cs galore, just as we knew he would", and his confrère, the "amazing" Chris Merritt, followed suit.