I can not think how I have failed to mention Lucine Amara before now. This grand lady sang at the Met 41 seasons! She made 882 appearances in 56 roles there! Who does that now?
Unfortunately there aren't enough videos of her singing. Here are some highlights.
Audio with slideshow, Nedda in Pagliacci at the Met, 1959:
Audio with slideshow, Pamina in The Magic Flute (English), the Met, 1956:
In concert in 1978, singing "Morro, ma prima in grazia" from Un Ballo in Maschera:
Private film with "Pace, pace" from La Forza del Destino: