2009 CTS4 Premium & 2021 Blazer 2LT
You can separate music by folder, but there is a limitation in how many folders the system will recognize. On mine which is version 2.5 it seems to be 250 folders. On my home PC I had my music originally separated by \artist\album but after I copied to a USB drive I went through and renamed these to \artist - album to cut down on the number of folders. This will still allow me to play music using the "Folder" selection in the audio menu, and it keeps songs separated by artist and album. If you lump everything together and choose to play by "Artist" then multiple albums will be combined, and if you play by "Album" well then the list is ordered by album name only.