Why is the musical scale the way it is? 12 keys: 7 major, 5 minor?
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the 12 tone equal tempered “western” musical system could be described geometrically as a spiral. Look up the twelfth root of 2.
An octave is double the frequency. For example, the note A440 vs A880. All Keys are related to each other. Some share more harmony than others. The more harmony they share, the better (more consonant) they sound. The less harmony they share, the worse (more dissonant) they sound.
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