it reminded me of what a beautiful singer Joan Baez was and is

Hmmm. That would be why she was so completely out of tune with Mr Zimmerman on With God On Our Side at Newport.

And not just out of tune. This is why It Ain't Me Babe was written about her. Cruel, maybe, but nobody's fault. It was pretty much like the Jagger/Richards composition Out Of Time about Ms Shrimpton. These things happen.