so called from the two accent marks of the symbol C″ representing the first C above middle C
circa 1931, in the meaning defined above
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two-lined chestnut borer
“Two-line octave.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/two-line%20octave. Accessed 22 Sep. 2023.
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