I was very sad to read that Beverly Sills died on Monday. She died of lung cancer, though she had never been a smoker.
You Tube has a good collection of recordings of her singing. Not sure this is the best, but my computer is way too slow to find out for sure.
She was an AMAZING singer and a true inspiration. Watching her sing on these You Tube clips, I'm not just impressed by the incredible beauty and flexibility of her voice, but also by the wondrous joy that exudes from her being as she sings.