Watch HDToday. Giuseppe Verdi's masterpiece calls for 4 great singers: one weak link and the whole may collapse. The Metropolitan Opera assembled a quartet of stars for this new production by David McVickar: Sondra Radvanovsky, Marcelo Álvarez, Dolora Zajick, and Dmitri Hvorostovsky. The opera - about mistaken identities and hair-raising bloody revenge - could hardly receive a better performance.