I sometimes wonder if it would do this thread and discussion any good to actually present the full collection of recordings made over the years and show interested parties where and how to identify and understand what is significant in them. I often feel it would either end in a battle of wits before the first point gets across, particularly when the assertion made up front is that you can't know anything without seeing the vocalist, or it would go over too many peoples heads, or they wouldn't read the reference material, or they wouldn't comprehend it.