Here’s a MIDI file of Scarlatti’s Sonata in A Major, K24/L495/P80, played on a physically-modeled virtual harpsichord tuned to A = 440 Hz:
Here it is again, this time with A = 432 Hz:
Did the first recording make you feel “self-centered, narcissistic, materialistic and aggressive“? Did the second resonate with the Heart Chakra, repair your DNA and restore your spiritual and mental health? If so, I congratulate you on your acute sensitivity. (Be sure to wear protective headgear at all times.)
Or did the second just sound a little flatter than the first?
Even if there is a real basis to the paranoid theories — extremely unlikely; the rise of the 440 standard is so complicated that positing a vast international conspiracy is inadequate to explain it — the precise frequency of the “A” in a scale matters far less than the qualities of the intervals between the notes of the scale.
The preset used for the two recordings above does not specify the temperament, which implies that it is equal-tempered. Other presets offer different tuning systems. Here is the sonata again, this time at A = 415, using an unspecified “well tempered” tuning:
And again, at A = 392, using “Werckmeister III“:
Even ordinary human beings who don’t wear tin-foil hats might be able to hear subtle differences in the character of the music now.