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I've heard the phrase "key of love" but was not aware that it was F. Interestingly, our current reference standard of A = 440 Hz was not set until 1939. This means that the sound of the "key of F" has changed. I did a bit of a search on Wikipedia and, if anyone is interested, here's an excellent article on the history of concert pitch.

History of concert pitch




The harsh reality is that less than one percent of the human population would even be able to detect this difference.


--Mac