"theoretical key" meaning in English

{
  "forms": [
    {
      "form": "theoretical keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "theoretical key (plural theoretical keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
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          "source": "w"
        },
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          "kind": "other",
          "name": "Terms with Greek translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "G-sharp major is a theoretical key with 8 sharps; in 12-tone equal temperament it is enharmonic to A-flat major, but in most other tunings, such as 31-tone equal temperament, it is a distinct key.",
          "type": "example"
        }
      ],
      "glosses": [
        "A key signature which has eight or more sharps or seven flats. In music using twelve-tone equal temperament its pitch coincides with its enharmonic, while in most other equal temperament tunings most enharmonic equivalences between key signatures regularly go beyond simple sharps and flats."
      ],
      "id": "en-theoretical_key-en-noun-ErF5JTC~",
      "links": [
        [
          "music theory",
          "music theory"
        ],
        [
          "key signature",
          "key signature"
        ],
        [
          "sharps",
          "sharp#Noun"
        ],
        [
          "flats",
          "flat#Noun"
        ],
        [
          "equal temperament",
          "equal temperament"
        ],
        [
          "enharmonic",
          "enharmonic"
        ]
      ],
      "qualifier": "music theory",
      "raw_glosses": [
        "(music theory) A key signature which has eight or more sharps or seven flats. In music using twelve-tone equal temperament its pitch coincides with its enharmonic, while in most other equal temperament tunings most enharmonic equivalences between key signatures regularly go beyond simple sharps and flats."
      ],
      "translations": [
        {
          "code": "el",
          "lang": "Greek",
          "roman": "fantastikí klímaka",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "φανταστική κλίμακα"
        }
      ]
    }
  ],
  "word": "theoretical key"
}

{
  "forms": [
    {
      "form": "theoretical keys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "theoretical key (plural theoretical keys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Greek translations",
        "Translation table header lacks gloss",
        "en:Music"
      ],
      "examples": [
        {
          "text": "G-sharp major is a theoretical key with 8 sharps; in 12-tone equal temperament it is enharmonic to A-flat major, but in most other tunings, such as 31-tone equal temperament, it is a distinct key.",
          "type": "example"
        }
      ],
      "glosses": [
        "A key signature which has eight or more sharps or seven flats. In music using twelve-tone equal temperament its pitch coincides with its enharmonic, while in most other equal temperament tunings most enharmonic equivalences between key signatures regularly go beyond simple sharps and flats."
      ],
      "links": [
        [
          "music theory",
          "music theory"
        ],
        [
          "key signature",
          "key signature"
        ],
        [
          "sharps",
          "sharp#Noun"
        ],
        [
          "flats",
          "flat#Noun"
        ],
        [
          "equal temperament",
          "equal temperament"
        ],
        [
          "enharmonic",
          "enharmonic"
        ]
      ],
      "qualifier": "music theory",
      "raw_glosses": [
        "(music theory) A key signature which has eight or more sharps or seven flats. In music using twelve-tone equal temperament its pitch coincides with its enharmonic, while in most other equal temperament tunings most enharmonic equivalences between key signatures regularly go beyond simple sharps and flats."
      ]
    }
  ],
  "translations": [
    {
      "code": "el",
      "lang": "Greek",
      "roman": "fantastikí klímaka",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "φανταστική κλίμακα"
    }
  ],
  "word": "theoretical key"
}