definition of upper octave.
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Octave, in music, an interval whose higher note has a sound-wave frequency of vibration twice that of its lower note. ... Thus the international standard pitch A above middle C vibrates at 440 hertz (cycles per second); the octave above this A vibrates at 880 hertz, while the octave below it vibrates at 220 hertz.
Any note that is twice the frequency of another note is one octave higher. Notes that are one octave apart are so closely related to each other that musicians give them the same name. A note that is an octave higher or lower than a note named "C natural" will also be named "C natural".
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