All sounds / notes have a certain wavelength, the closer two wavelengths are to each other, the “cleaner” it sounds
A “major” third is more in harmony than a “minor” third. Which is why old rock songs with distorted amps often use major chords, cuz they sound cleaner and thus “happier”
Chords like the triad sound “out of tune” because it’s as far from in harmony as you can get.
TLDR; minor chords are slightly more out of tune than a major chord.
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