"insert song" meaning in English

{
  "forms": [
    {
      "form": "insert songs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "insert song (plural insert 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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Japanese translations",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1998, jinrou, “[Poll] Series w/ best music”, in rec.arts.anime.music (Usenet):",
          "text": "Fushigi Yuugi - some of the insert songs are weak, but the BGM and op/ed make up for it.",
          "type": "quote"
        },
        {
          "ref": "2001, Erky the Sanctimonious Pundit, “Card Captor Sakura insert song”, in rec.arts.anime.music (Usenet):",
          "text": "Can anyone tell me the title of the insert song from epsiode^([sic]) 40 that occurs about halfway through?",
          "type": "quote"
        }
      ],
      "glosses": [
        "A piece of incidental music in anime."
      ],
      "id": "en-insert_song-en-noun-FptaDNYj",
      "links": [
        [
          "incidental music",
          "incidental music"
        ],
        [
          "anime",
          "anime"
        ]
      ],
      "translations": [
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "sōnyūka",
          "sense": "piece of incidental music in anime",
          "word": "挿入歌"
        },
        {
          "code": "ja",
          "lang": "Japanese",
          "roman": "gekichūka",
          "sense": "piece of incidental music in anime",
          "word": "劇中歌"
        }
      ]
    }
  ],
  "word": "insert song"
}

{
  "forms": [
    {
      "form": "insert songs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "insert song (plural insert songs)",
      "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 quotations",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Japanese translations"
      ],
      "examples": [
        {
          "ref": "1998, jinrou, “[Poll] Series w/ best music”, in rec.arts.anime.music (Usenet):",
          "text": "Fushigi Yuugi - some of the insert songs are weak, but the BGM and op/ed make up for it.",
          "type": "quote"
        },
        {
          "ref": "2001, Erky the Sanctimonious Pundit, “Card Captor Sakura insert song”, in rec.arts.anime.music (Usenet):",
          "text": "Can anyone tell me the title of the insert song from epsiode^([sic]) 40 that occurs about halfway through?",
          "type": "quote"
        }
      ],
      "glosses": [
        "A piece of incidental music in anime."
      ],
      "links": [
        [
          "incidental music",
          "incidental music"
        ],
        [
          "anime",
          "anime"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "sōnyūka",
      "sense": "piece of incidental music in anime",
      "word": "挿入歌"
    },
    {
      "code": "ja",
      "lang": "Japanese",
      "roman": "gekichūka",
      "sense": "piece of incidental music in anime",
      "word": "劇中歌"
    }
  ],
  "word": "insert song"
}