Just to put the "numbers" in perspective with regard to early music: does anyone know exactly when Hertz devised his scale of musical pitch? And when did technology develop measuring equipment capable of determining exactly how many cycles per second an instrument is emitting? Because, obviously, the numbers 440 or 432 wouldn't have had any significance before that. I've heard that Bach used quite a bit of numerology in his compositions, but the Hertz value wasn't one of the numbers involved!
I recently had a key experience with concert pitches. My daughter's choir was involved in a "historically informed" performance of J.S. Bach's Matthew Passion. She told me that they were doing it "about a semitone" lower than modern pitch (which would make it about A=315 Hz, if I've read the earlier postings correctly; a couple of Hertz more or less makes no difference to a singer

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And I must say, the performance knocked my socks off! I'd never heard Bach sounding so magnificent.
However, to contribute to this discussion, the concert pitch was only one of many parameters that distingushed this performance from other Bach cantatas I've heard.
First of all, the entire string section was strung with gut, not wire. And the woodwinds were all replicas without mechanical flaps - the transverse flutes being, of course, wooden. The trumpet parts were played by an independent trumpet ensemble with natural trumpets and kettle drums, such as Bach would have hired for his performances, and even the solo horn was a valveless instrument.
The timbre of the string section was just so smooth and homogeneous, and yet the parts were clearly distinguishable. The natural trumpets have a wildness about them and a slight edginess that the valves of a modern, equal-tempered trumpet just cancel out. I noticed that the oboist swapped instruments for numbers in different keys - I didn't get an opportunity to ask, but this could have been because they weren't equal-tempered, and each one only sounded "right" in one key. And of course, the semitone lower meant that the sopranos' and tenors' high notes were well within their range.
So I can say that this low-pitched performance thouroughly entranced me, but I'm quite certain that this entrancement was due to the smoothness of the gut strings and the intonation of the woodwind instruments, contrasting with the wildness of the natural trumpets and horn, which are definitely not equal-tempered. And you only get those as part of a package with the lower concert pitch. An A=440 performance would have had the usual screeching violins (and sopranos), domesticated brass, and harsh, equal-tempered woodwinds. That would have been inspiring, too - but the "historically informed package," which you might, only for convenience, label the "315Hz version" was just that bit more.
Blessings,
Jack Greenman