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I also have perfect pitch, and it was actually an article posted here on HN that made me realize no, I'm not crazy, my perfect pitch has gone flat with age (I'm 29) and having not played violin regularly.

Me and a friend figured it out, I've pitched down from the 440 Hz standard to 428 Hz.

View on HN

What was the reason?

Age, some people even lose it completely, there was a thread here on HN some months ago where this was discussed

So A = 440 Hz rather than 432 Hz is not a Nazi conspiracy; it was just Mozart hitting his 30th birthday vs. when he was young? We can finally be at peace that Justin Bieber's pop song is tuned to 440 Hz... /s

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