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Fifteenth

Fifteenth

In music, a fifteenth or double octave, abbreviated 15ᵐᵃ, is the interval between one musical note and another with one-quarter the wavelength or quadruple the frequency. It has also been referred to as the bisdiapason. The fourth harmonic, it is... Wikipedia
Abbreviation: P15
Interval class: 0
Just interval: 4:1
Semitones: 24
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