The Parallel Universe

I live in cropredy where this group have their annual reunion each August.
sandy denny is in the aether flows, but still here, her voice is stunning.
I hope we can talk about sound and resonance, as it should be, A=440.
Somebody has altered that about?
I consider Dr Brown will have been using pure sound, as nature does.
http://www.lyricscrawler.com/song/85899.html
http://www.youtube.com/watch?v=n2xODjbfYw8

I first ever heard this song via the Judy Collins version, so I'm still rather partial to it. The solo guitar improvs always appealed to me. Didn't learn of Sandy Denny till much later, but I guess the real credit goes to her.