You know what it looks like… but what is it called?
TAKE THE QUIZ“mean tone”
We have one entry that includes the term mean tone.
meantone system
noun: a system of tuning keyboard instruments used before the adoption of equal temperament and based on a standard interval of a mean between a major and a minor whole tone of just intonation or one half of an acoustically pure major third
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Merriam-Webster unabridged
