Amercian Tenor Stephen Mark Brown sings Achille's Act II aria from Gluck's - Iphigénie en Aulide, "Chantez, Célébrez votre Reine" for the opening of the season of La Scala. He was honored to be asked by the great Riccardo Muti to learn the role and step in on a mere three day's notice. With Violetta Urmana, soprano. Daniela Barcellona, mezzo soprano.