The notes of the major third C-E (C4 or middle C to E4) have these frequencies:
|C4 (middle C)||260 Hertz|
We may think that the difference in frequencies determines the size of the interval:
325 - 260 = 65
However, this is not correct. The same notes one octave lower, give a different result despite being the same interval:
162.5 - 130 = 32.5
Therefore, there is another mathematical operation that we must use to measure musical intervals correctly.
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