The very talented mezzo Sheila Nadler was given a masterclass at Juillard by Maria Callas in the role of Amneris in Aida.
One Callas remark might be astonishing about staying beautiful in any occasion, even in tragedy, at the end. Because Callas would not care, during her career about just sounding or looking beautiful if the dramatic necessity needed more roughness. But one must remember that Amneris is a royal princess, not Santuzza, not Medea.