{
    "model": {
      "type": "minecraft:select",
      "property": "minecraft:custom_model_data",
      "cases": [
        {
          "when": "real_music_disc_chirp",
          "model": {
            "type": "minecraft:model",
            "model": "item/real/real_music_disc_chirp"
          }
        }
      ],
      "fallback": {
        "type": "minecraft:model",
        "model": "item/music_disc_chirp"
      }
    }
  }