"perpetual canon" meaning in English

{
  "forms": [
    {
      "form": "perpetual canons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "perpetual canon (plural perpetual canons)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A limited type of canon in which three or more voices sing exactly the same melody at the unison (and may continue repeating it indefinitely), but with each voice beginning at different times so that different parts of the melody coincide in the different voices, but nevertheless fit harmoniously together."
      ],
      "id": "en-perpetual_canon-en-noun-qdJ04OHm",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "voice",
          "voice"
        ],
        [
          "melody",
          "melody"
        ],
        [
          "unison",
          "unison"
        ],
        [
          "harmonious",
          "harmonious"
        ]
      ],
      "raw_glosses": [
        "(music) A limited type of canon in which three or more voices sing exactly the same melody at the unison (and may continue repeating it indefinitely), but with each voice beginning at different times so that different parts of the melody coincide in the different voices, but nevertheless fit harmoniously together."
      ],
      "synonyms": [
        {
          "word": "infinite canon"
        },
        {
          "word": "round"
        }
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "perpetual canon"
}

{
  "forms": [
    {
      "form": "perpetual canons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "perpetual canon (plural perpetual canons)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English multiword terms",
        "English nouns",
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        "en:Music"
      ],
      "glosses": [
        "A limited type of canon in which three or more voices sing exactly the same melody at the unison (and may continue repeating it indefinitely), but with each voice beginning at different times so that different parts of the melody coincide in the different voices, but nevertheless fit harmoniously together."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "voice",
          "voice"
        ],
        [
          "melody",
          "melody"
        ],
        [
          "unison",
          "unison"
        ],
        [
          "harmonious",
          "harmonious"
        ]
      ],
      "raw_glosses": [
        "(music) A limited type of canon in which three or more voices sing exactly the same melody at the unison (and may continue repeating it indefinitely), but with each voice beginning at different times so that different parts of the melody coincide in the different voices, but nevertheless fit harmoniously together."
      ],
      "synonyms": [
        {
          "word": "infinite canon"
        },
        {
          "word": "round"
        }
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "perpetual canon"
}