Concert pitch
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Concert pitch is the pitch reference to which a group of musical instruments are tuned for a performance. Concert pitch may vary from ensemble to ensemble, and has varied widely over time. The ISO def
A circa 1932 Boosey & Hawkes 'Model 32' alto saxophone stamped 'LP' for Low Pitch (A=440 Hz). Saxophones tuned to A=456 Hz would be marked 'H', 'HP' or 'High Pitch'
A 1915 Buescher Truetone alto saxophone marked 'High Pitch' (A=456 Hertz). Saxophones tuned to A=440 Hz would be marked 'L', 'LP' or 'Low Pitch'
A 1927 Conn New Wonder Series 2 alto saxophone marked 'H' for 'High Pitch' (A=456 Hertz)
Reductio ad Hitlerum
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Reductio ad Hitlerum, also known as the Hitler fallacy or playing the Nazi card, is an attempt to invalidate someone else's argument on the basis that the same idea was promoted or practised by Adolf
Concert pitch
…the predominant 440 Hz. These claims also include conspiracy theories, related to specious claims of healing properties from 432 Hz pitch, or involving Nazis having favored the 440 Hz tuning…
Adolf Hitler, the dictator of Nazi Germany from 1933 to 1945
The phrase was coined by philosopher Leo Strauss.