three-line octave


Definition of three-line octave 

: the musical octave beginning with and ascending from the second C above middle C — see pitch illustration

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First Known Use of three-line octave

circa 1931, in the meaning defined above

History and Etymology for three-line octave

so called from the three accent marks of the symbol C′″ representing the second C above middle C

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The first known use of three-line octave was circa 1931

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