{
  "disc_number": {
    "old": "3"
  },
  "disc_title": {
    "new": "Disk 3"
  },
  "legacy": {
    "cdtext_title": {
      "new": "Portal 2 Volume 3"
    },
    "track_title": {
      "new": "Robots FTW"
    }
  }
}