I recently found this article:
Real-Time 432 Auto-Pitching Video Player
And I wanted to chime in and share my findings - I think they're on to something! I used VLC on my Mac Mini to change the frequency to 432Hz, then opened the same song in iTunes using the default frequency.
The VLC / 432Hz configuration sounded much less harsh! Amazing.
It turns out that in 1936, the powers that be decided to re-tune "A" to be 440hz instead of 432hz. So since then, we've been listening to music that irritates us at a cellular level. It causes stress an disease: