As we have fairly solid support for the idea suggested in Can we add "Vocal critique" to our list of 'and not about' in the Help/on topic page? - so far 28 upvotes across the question & all answers, without a single downvote - let me start the ball rolling on the wording…
and is not about…
Performance critique of any sort. Including but not limited to; external links to your own performance with requests such as, "How good is my voice?", "What is my vocal range?", "How could I improve my saxophone solo?"
Maybe it's a little long, but I wanted to try hit some specific question types we see a lot, and also emphasise that if you're going to post your performance up to YouTube or Vocaroo etc, we're not interested.
Apart from anything else, as soon as they got an answer, they'd take the link down & break the question forever.