The Met’s monumental staging is a dazzling backdrop for the star-crossed love story set amid the clash of ancient empires. Three commanding sopranos—Liudmyla Monastyrska, Latonia Moore, and Krassimira Stoyanova—appear in the title role, the slave girl Aida,who is secretly a princess. Ekaterina Gubanova and Violeta Urmana are the formidable Amneris, daughter of the Egyptian pharaoh, and Marco Berti is the hero Radamès, caught between them. Marco Armiliato and Daniele Rustioni conduct.