I happen to think that Callas was the greatest singer of the 20th century. I feel that so many people have learned the wrong things from her, rather than the right things. She was a fabulous musician. When you listened to her, you could almost take dictation. All the dots were there. Anything that was wrong was because of the deterioration of the instrument over time. But usually musical things were not wrong. She has pitch problems and wobbles that came in later.