Nyquist?
https://en.wikipedia.org/wiki/Nyquist_frequencyThe graph overshoots so the sampling is not correct. Not good for your ears. Just like my Marshall 130 watt clone is not good to my ears: London City, just from
1966 1969, made in Amsterdam. The latter is less painful than sampling overshoots and more mellow, but too loud.
Anything recorded like that can be thrown away.
What it shows is ear problems and a bad mixer (human, not table)
And even if it is called "concert pitch" it is waaaaay to high. (My Piano tuned at 402, which is low, but more natural)