The difference between album pb and case is the collection value.

The album case version is the gem version. This kind of album is relatively cheap, but it is packed in a CD box and does not have any photos, but it also has a small card.

The PB version of the album refers to the photo book version, which is a book with a CD and a small card stuck in the middle. It is a book that can be flipped through and read, and the price is a bit more expensive. It depends on what you like, and if you have the ability, you can buy them all.

Music album:

Music album is the most important way of releasing modern music. It usually consists of 10-25 songs and is mostly between 12 and 74 minutes in length (exceptions are not excluded) ).

Generally speaking, the order of songs in an album should be carefully considered. Listening to this order, the whole album will give people a feeling that is greater than the simple sum of the songs, that is, the whole is greater than the sum of its parts. Meaning, especially a conceptual album.

Physical albums generally include four parts: sleeves, CDs, photos, and lyrics books. Some revised albums will have a DVD or VCD of the album's title song MV attached.