Is this denormalization normal in Mongodb?

Question

MongoDB

Good afternoon. Recently started using MongoDb and got a question about denormalization.
Introductory
MediaCollection

{
 "_id": ObjectId("5584367e44ae3e41ad5481a3"),
 "createdAt": ISODate("2015-06-19T15:34:22.927Z"),
 "title" : "CD",
 "properties": [
   {"title": "format", value: "digital"},
   {"title": "material", value: "plastic"}
  ]
}
{
 "_id": ObjectId("5584367e44ae3e41ad5481a4"),
 "createdAt": ISODate("2015-06-19T15:34:22.927Z"),
 "title" : "Vinyl",
 "properties": [
   {"title": "format", "value": "analog"},
   {"title": "material", "value": "vinyl"},
   {"title": "size", "value": "12in"},
  ]
}

Music Collection

{
 "_id": ObjectId("5584367e44ae3e41ad5481a8"),
 "createdAt": ISODate("2015-06-19T15:34:22.927Z"),
 "artist" : "Pink Floyd",
  "title": "The Wall",
 "properties": [
   {"title": "year", value: "1988"},
   {"title": "style", value: "Rock"}
  ],
  "media": {
    "_id": ObjectId("5584367e44ae3e41ad5481a4"),
    "createdAt": ISODate("2015-06-19T15:34:22.927Z"),
    "title" : "Vinyl",
    "properties": [
      {"title": "format", "value": "analog"},
      {"title": "material", "value": "vinyl"},
      {"title": "size", "value": "12in"},
     ]
   }
}

Questions:
1. Is such a strong denormalization normal for MongoDb?
2. Is it normal to update the media fields in all MusicCollection records when changing any document in the MediaCollection?

Answer 1

This is too much, IMHO, in this case it is better to add ObjectID from MediaCollection.
I don’t see any advantages in such a decomposition, but there are a lot of problems.