I'd like to hijack and say again that little iddy biddy tiles in the bottom details list would totally round out the library view. Think about it, you click on a tile in the top list and it filters out the bottom list to show something like the album thumbnails now, but on each thumbnail is a little "files" link. Clicking on that shows you the songs for that album, and hovering in the corner is a little "back" button to take you back to the tiley album thumbnails.
It would be faster than clicking on "files" in the top album view because, as it stands, you have to keep clicking in a level until you can find the album with the tile you want to see the files for. Or, you have to switch from "album thumbnails view" to "files view" and then scroll through the list to find the song that you want to.
Feasibly, with my suggestion, as long as you can see the album in the bottom list, at any level in the top one, you'd be able to jump to just the songs of that album, for tagging and individual song choices almost instantly.