"signature song" meaning in English

{
  "etymology_text": "See the main entries. Formed as a compound in the 1920s.",
  "forms": [
    {
      "form": "signature songs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signature song (plural signature songs)",
      "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": "Terms with French translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Italian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Japanese 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"
        }
      ],
      "glosses": [
        "A song in which its artist or band is best associated with or known for."
      ],
      "id": "en-signature_song-en-noun-yPhokQ7r",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "artist",
          "artist"
        ],
        [
          "band",
          "band"
        ],
        [
          "associate",
          "associate"
        ]
      ],
      "raw_glosses": [
        "(music, usually in the singular) A song in which its artist or band is best associated with or known for."
      ],
      "related": [
        {
          "word": "signature tune"
        }
      ],
      "tags": [
        "singular",
        "usually"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "the song a performer is primarily associated with",
          "tags": [
            "feminine"
          ],
          "word": "chanson phare"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "the song a performer is primarily associated with",
          "tags": [
            "masculine"
          ],
          "word": "cavallo di battaglia"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "daihyōkyoku",
          "sense": "the song a performer is primarily associated with",
          "word": "代表曲"
        }
      ],
      "wikipedia": [
        "signature song"
      ]
    }
  ],
  "word": "signature song"
}

{
  "etymology_text": "See the main entries. Formed as a compound in the 1920s.",
  "forms": [
    {
      "form": "signature songs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signature song (plural signature songs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "signature tune"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Terms with French translations",
        "Terms with Italian translations",
        "Terms with Japanese translations",
        "en:Music"
      ],
      "glosses": [
        "A song in which its artist or band is best associated with or known for."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "singular",
          "singular"
        ],
        [
          "artist",
          "artist"
        ],
        [
          "band",
          "band"
        ],
        [
          "associate",
          "associate"
        ]
      ],
      "raw_glosses": [
        "(music, usually in the singular) A song in which its artist or band is best associated with or known for."
      ],
      "tags": [
        "singular",
        "usually"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ],
      "wikipedia": [
        "signature song"
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "the song a performer is primarily associated with",
      "tags": [
        "feminine"
      ],
      "word": "chanson phare"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "the song a performer is primarily associated with",
      "tags": [
        "masculine"
      ],
      "word": "cavallo di battaglia"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "daihyōkyoku",
      "sense": "the song a performer is primarily associated with",
      "word": "代表曲"
    }
  ],
  "word": "signature song"
}