At the Metropolitan Opera last spring, in a show called "The Exterminating Angel", soprano Audrey Luna sang a high A, setting a new record for the highest note ever sung at the Met. You might be more familiar with the phrase "High C", a very typical high note at the Met - the high A is several notes higher. And it's the first thing Luna sings in the show. She spent years working her voice up to that pitch. So we asked her how she did it.