"I think that it was Paul Winter that said that he finds that much of nature seems to sing in the key of D. Has anyone noticed that? I can't say that I can tell that much. "

Actually, scientists are thinking that nature sings in Bb. Recently there was an extremely low frequency discovered in deep space that oscillated on the pitch we call Bb, but about 17 octaves below the range of human hearing. Also, I remember in college discovering that all flourescent lights buzz on a Bb. Check it out.

The way this was discovered by me and the choir I was singing in is another story that doesn't need detailing here.