With this question, I'm referring to the rock and roll bands who hang on into their 60's, 70's, and (gulp!) beyond. Your "Rolling Stones", "Queen", "Aerosmith", "Paul McCartney" types of acts. At what point should they say, "OK. Enough. I'm embarrassing myself and look/sound ridiculous. I am officially retiring from performing music for money." ??? Personally, I feel that once you sound much worse than you used to and are no longer overly entertaining, you should hang it up and enjoy spending your money in retirement. You can't hide your flaws any more. In this world of smart phone video recordings from all angles throughout every arena that you perform in, people are going to know what you really sound like. So, at some point, these guys could be damaging their long-term legacies and reputations by having too many of the really bad performances saved for all time on the internet. I feel as though we're on the verge of that with some hall of famers and wanted to see what others thought. .