I've seen snippets and that was more than enough for me. In general, I stop watching and listening to once great singers who just can't do it anymore but they keep doing it anyway. They talk through their songs, or their range is reduced to just a few notes, their vibrato becomes a warble in slow-motion, the quality of the voice is thin, scratchy, and just wretched. I know that it's a common thing as they age but I just can't listen to them when it gets to that point. Liza Minelli, Frank Sinatra, and Dionne Warwick come to mind.
