"Axis progression" meaning in English

{
  "etymology_text": "From the name of a musical comedy group, The Axis of Awesome, whose 2009 song Four Chords comments on the ubiquity of this progression.",
  "head_templates": [
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      "args": {
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      "expansion": "Axis progression (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
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          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The Axis progression in the key of C:\n{1}",
          "type": "example"
        },
        {
          "ref": "2017, Mark Richards, “Tonal Ambiguity in Popular Music's Axis Progressions”, in Music Theory Online:",
          "type": "quote"
        }
      ],
      "glosses": [
        "A chord progression, I–V–vi–IV, used in Western popular music, common since the 1970s."
      ],
      "id": "en-Axis_progression-en-noun-nm0uRAMS",
      "links": [
        [
          "Western",
          "Western"
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        [
          "popular music",
          "popular music"
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      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "The Axis of Awesome"
      ]
    }
  ],
  "word": "Axis progression"
}

{
  "etymology_text": "From the name of a musical comedy group, The Axis of Awesome, whose 2009 song Four Chords comments on the ubiquity of this progression.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "Axis progression (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Music"
      ],
      "examples": [
        {
          "text": "The Axis progression in the key of C:\n{1}",
          "type": "example"
        },
        {
          "ref": "2017, Mark Richards, “Tonal Ambiguity in Popular Music's Axis Progressions”, in Music Theory Online:",
          "type": "quote"
        }
      ],
      "glosses": [
        "A chord progression, I–V–vi–IV, used in Western popular music, common since the 1970s."
      ],
      "links": [
        [
          "Western",
          "Western"
        ],
        [
          "popular music",
          "popular music"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "The Axis of Awesome"
      ]
    }
  ],
  "word": "Axis progression"
}