La Cieca has just heard that Roberto Alagna will sing his first Met Radames tomorrow night, replacing the ailing Marco Berti. Which means, if you haven’t guessed it yet, that Marcello Giordani is jumping into tonight’s Butterfly. By the end of the season, Giordani will have five different roles in his Met repertoire for 2007-08: Edgardo, Roméo, Pinkerton, Ernani and des Grieux (Manon Lescaut.)