- hepta- + tonic (Wiktionary)
“Now, with my own lips, I have played notes from Subterranean flutes twenty-five thousand years old standard diatonic to heptatonic, including a flatted la and a neutral third for mi, i.e., a blue note.”
“We have already remarked that the current medieval theory laid down for the tone system a heptatonic diatonic scale of about two octaves with the addition of b flat in the higher octave.”
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