This doesn’t make any sense to me, these are just sounds, they don’t sound neither happy nor sad to me (when I try playing them on piano). But I’m new to music so I don’t know… Is there an explanation that actually makes sense?
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something i don’t see explained (well) here is *what* consonance/dissonance is. Basically, when you have a tone/note, it is a sound wave vibrating at a certain speed. a 100hz tone hits the peak of its wave 100 times per second. a 200hz tone would hit that peak 200 times, meaning that the peak of the first wave will always line up with every other peak of the second. This is called an octave, and having so many peaks line up consistently makes it a **consonant** sound. The next most consonant ratio of notes in western music is the perfect fifth, where every second peak of the one wave meets every third peak of the other. The major third has every fourth peak meet every fifth peak, and the minor third has every fifth peak meet every sixth peak. Because of this, the minor third has more of its peaks not lining up with any of the other peaks in a chord than the major third. The more peaks a note has that don’t match with anything else in the chord, the more **dissonant** it is, and that means the minor third is more dissonant than the major third. In western music we generally have more positive feelings associated with lots of consonance and more negative feelings associated with dissonance, so the more dissonant minor is usually felt to be sad, and the more consonant major happy.
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