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That's all very interesting...

But the harmonic or inharmonic content of the instrument does not address the original question.

And it leads to confusion; putting your first and last sentences together implies that a piano is not a western musical instrument. We know that's not true.

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Piano timbre is approximately harmonic. The inharmonicity is subtle enough that you can ignore it and it will still sound okay. Same is true with plucked string instruments. You're still using Western music theory.

Yes, of course. I've tuned pianos, so I'm not disagreeing with that.

I'm just struck by the zenlike simplicity of the original question, "What is a Major Chord?", compared to the random bits of technical jibber-jabber that would confuse the hell out of a poor soul who would dare to ask such a question, both in the linked blog post, and the discussion here.

The motivating question, which I quote at the beginning, was actually: what is a chord? what is a major chord? what is a note? what is a first/fourth/fifth note? is there a 65th note? what is a scale? what is a major scale? what does it mean that a note is of a scale? what does it mean that a chord uses a note? is there a difference between a chord using a note of a scale and not of a scale?

I picked one of them for the title of my post, but I'm trying to answer them all.

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