I just added an example and thought I would share.
There are three release events here, 2 are different countries for iTunes. They are all grouped here as they are all three distributing files that are AAC-LC encoded at a high bitrate, iTunes being 256 and the JP one 320, both sitting comfortable well past the general transparency point and at top of class for lossy encoded files.
I wanted to show how a separation might look, where Spotify and Amazon are not mixed as they are different types, stream only and MP3 encoded. The “point” of this release is to group AAC at a high bitrate. So for me (in my opinion) I would look here if I wanted a lossy digital release with the best quality in general retail. Or for some, files that are compatible with Apple products, etc. I am hoping to illustrate some of the logic in the grouping process.