"Alzira" is the seventh work and the sixth opera to be published in the critical edition of "The Works of Giuseppe Verdi." Composed during the middle of the very productive period of Verdi's first large-scale successes, "Alzira" premiered at Naples on August 12, 1845. Cammarano's libretto is based on a play of Voltaire, who used a real incident in sixteenth-century Peru during the Spanish conquest to shape a critique of the morality of the noble savage as against Christian values. The inherent conflicts and exotic setting appealed to Verdi's dramatic sense, and in its best moments the music...