Cori Ellison: “In a perfect world, everybody would understand every language and every singer’s diction would be perfect, and we wouldn’t need supertitles. That is never going to happen and it never has been the case. … Also, you can read the libretto of Barber of Seville until the cows come home but it’s not going to give you the same moment-to-moment comprehension as when you’re in the theater and seeing something that is so coordinated with the translation of it.”