The mathematics of frequencies. A note has a frequency of vibration. The note one octave above it, the 8th note higher away, is twice the frequency of the first note. That’s why an octave is 7 notes. The 8th noteeay sounds like the same sound only higher or lower.
Onlinekyne has an excellent series of reels over on Facebook explaining the math of music. I think it’s also called Math in drag or something. Crystal-clear explanations, really.
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