Webb grew up outside Kansas City, Mo., and was a church music minister when he entered a vocal competition in 1993. He won first prize, earning an opera seminar and master classes with bass Giorgio Tozzi. Webb had never seen a professional opera production at the time, according to his Web site.
He started studying with soprano/mezzo-soprano Margaret Harshaw later in 1993 and with tenor Carlo Bergonzi in 2001. According to his Web site, he has sung with several U.S. companies, including New York City Opera, Madison Opera, Sarasota Opera and Utah Opera.
Met spokesman Jonathan Tichler said Alvarez had felt too ill at intermission to continue the performance.
The rest of the cast remained the same as at the Feb. 16 premiere of the David McVicar production: soprano Sondra Radvanovsky (Leonora), mezzo-soprano Dolora Zajick (Azucena), Hvorostovsky (Count di Luna) and bass Kwangchul Youn (Ferrando), with Gianandrea Noseda conducting.
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