Have you ever wondered why music and chords exist in the world, and why they seem to be inherent in nature? Why is it that even if you've never studied music, you instinctively know which chords or melodies sound pleasant? First, let's clarify one thing: sound is essentially air vibration. Where there is vibration, there is frequency—how many times it oscillates per second. In essence, every note is a number. Since they are numbers, we can strip away the 'music' and look at the raw data. If we represent every note as a numerical value, we discover that harmony and dissonance in music theory are actually mathematically calculable. Even whether a song sounds 'good' can be determined by math. Take the most classic chord, the major triad (Do-Mi-Sol). Its frequencies are 264, 330, and 396 Hz. Notice something? These three numbers share a greatest common divisor: 66. 264/66 = 4, 330/66 = 5, and 396/66 = 6. The ratio is 4:5:6—perfect integers. Or consider an octave: a 'Do' at 264 Hz and the next 'Do' at 528 Hz, which is exactly double. The reason we find certain melodies pleasant is that they can be expressed as frequencies, and these frequencies relate to each other through integer ratios. Chords weren't really 'invented' by humans; they are structures that already exist in nature. Music theory didn't create the rules; it merely discovered and documented these existing acoustic truths. So, when you think you are hearing art, you are actually hearing physics. When you feel beauty, you are experiencing the underlying math of the universe.
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