Having seen him perform multiple times over the decades, he never disappointed, and was always always respectful of the song. Great is too small a description.
I was really sad and disappointed when his wife allowed him to be "highlighted" on some show, maybe CNN, maybe Sixty Minutes a few years back. I thought Tony had so much self-respect, and it was always on display, that if he were consciously aware of what was taking place he would have been horrified.