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Base data: Interval．
An octave is the eight-note interval between two notes. The frequency ratio is 2:1
The eighth interval of do re mi intervals
The eight do re mi intervals are called an octave. What does the word octave remind you of? That’s right, it derives from the same word as an octopus, which of course has eight legs. When one octave increases, the frequency of the sound vibration doubles.
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