The Metropolitan Opera House was awash in pearls and tuxedos on a recent gala evening. Socialites traded political gossip by the bar, and bankers discussed coming vacations in the Maldives. Then a golden elevator door slid open and a glamorous figure slipped out.

To the generations of opera singers that came after her, she’s still an era-defining consummate artist. “She’s an icon. There’s no other way to put it,” said bass Morris Robinson, who recently sang the role of Ramfis in “Aida” with Boston Lyric Opera.

“Maria,” Pablo Larraín’s cinematic portrait of opera legend Maria Callas, arrives as the third of the director’s films centered on iconic women of the 20th century.