I have never heard anyone say that the note in Natural Women was a bad note until now. I think why some people think it was a bad note is because Kelly slid up to it, she started at an E6 and then slid up to an #F6. It was not a bad note at all. AND Kelly did that note with vibrato and doing vibrato in whistle register is not easy at all, so that note demonstrates in my opinion the amazing control Kelly has. And it also shows that Kelly is an Octave Jumper, she went from the 4th octave to the 6th all in the same breath!