Tip: See my list of the Most Common Mistakes in English. It will teach you how to avoid mistakes with commas, prepositions, irregular verbs, and much more. Would you believe that there is a conspiracy theory about the way we tune musical instruments? And that this theory even involves the Nazis, chakras, and whatnot? No? Then sit down and enjoy perhaps the most ridiculous conspiracy theory
![The “432 Hz vs. 440 Hz” conspiracy theory](https://cdn-ak-scissors.b.st-hatena.com/image/square/dbc5ec022d54f57370f14b49d41a284c98fee471/height=288;version=1;width=512/https%3A%2F%2Fjakubmarian.com%2Fimages%2Fog%2Fmusic.jpg)