"AM pop" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "61 39",
          "kind": "topical",
          "langcode": "en",
          "name": "Musical genres",
          "orig": "en:Musical genres",
          "parents": [
            "Genres",
            "Music",
            "Entertainment",
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
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      "glosses": [
        "Music, especially rock music ballads and crossover material, played on top 40-formatted AM radio stations, especially during the 1970s."
      ],
      "id": "en-AM_pop-en-noun-lWOqkyfT",
      "links": [
        [
          "rock music",
          "rock music"
        ],
        [
          "ballad",
          "ballad"
        ],
        [
          "crossover",
          "crossover"
        ],
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          "top 40",
          "top 40"
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        "uncountable"
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      ],
      "glosses": [
        "Soft rock music, especially that produced prior to the early 1980s."
      ],
      "id": "en-AM_pop-en-noun-3-KWDTTQ",
      "tags": [
        "uncountable"
      ]
    }
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  "word": "AM pop"
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    "en:Musical genres"
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      "expansion": "AM pop (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "Music, especially rock music ballads and crossover material, played on top 40-formatted AM radio stations, especially during the 1970s."
      ],
      "links": [
        [
          "rock music",
          "rock music"
        ],
        [
          "ballad",
          "ballad"
        ],
        [
          "crossover",
          "crossover"
        ],
        [
          "top 40",
          "top 40"
        ]
      ],
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        "uncountable"
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    },
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        "Soft rock music, especially that produced prior to the early 1980s."
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        "uncountable"
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  "word": "AM pop"
}