"Parsons code" meaning in English

{
  "etymology_text": "Developed by Denys Parsons for his 1975 book The Directory of Tunes and Musical Themes.",
  "forms": [
    {
      "form": "Parsons codes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Parsons code (plural Parsons codes)",
      "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"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A simple notation used to identify a piece of music through the falling and rising motion of its pitch."
      ],
      "id": "en-Parsons_code-en-noun-YVH1AZLf",
      "links": [
        [
          "notation",
          "notation"
        ],
        [
          "identify",
          "identify"
        ],
        [
          "music",
          "music"
        ],
        [
          "motion",
          "motion"
        ],
        [
          "pitch",
          "pitch"
        ]
      ],
      "wikipedia": [
        "Parsons code"
      ]
    }
  ],
  "word": "Parsons code"
}

{
  "etymology_text": "Developed by Denys Parsons for his 1975 book The Directory of Tunes and Musical Themes.",
  "forms": [
    {
      "form": "Parsons codes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Parsons code (plural Parsons codes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Music"
      ],
      "glosses": [
        "A simple notation used to identify a piece of music through the falling and rising motion of its pitch."
      ],
      "links": [
        [
          "notation",
          "notation"
        ],
        [
          "identify",
          "identify"
        ],
        [
          "music",
          "music"
        ],
        [
          "motion",
          "motion"
        ],
        [
          "pitch",
          "pitch"
        ]
      ],
      "wikipedia": [
        "Parsons code"
      ]
    }
  ],
  "word": "Parsons code"
}