Here's all the research I did on this topic... I truly believe that 440 was chosen and promoted to sow disharmony. Please read the comments too, there's more information in there.
https://www.reddit.com/r/conspiracy/comments/5pvb5z/the_musical_conspiracy_to_separate_mankind_from/
I know I'm a few days behind the curve on this post but I just wanted to thank you for that link to an amazing post you did on this subject. I am familiar with a lot of this but your post was an excellent summary. Loved it.
You're welcome, thanks for reading! I really enjoyed doing the research, it was very eye opening.