All of the tags display correctly, but SqueezeCenter shows the wrong information at the album level.  

SC 7.x and 7.2.1
Local Music (no Itunes)
Music digitized with MP3Tag v2.41
Customer's directory structure:

G:\Music\Songs\0-9
G:\Music\Songs\A-E
G:\Music\Songs\F-J
G:\Music\Songs\K-O
G:\Music\Songs\P-T
G:\Music\Songs\U-Z

The songs are all stored in the Songs sub-folders based on the album name.  SqueezeCenter reports the following statistics: 

Total Tracks: 13,600

Total Albums: 877

Total Artists: 1,334

Total Genres: 26

Total Playing Time: 1024:10:33

**Steps to recreate the issue**

Create a folder called "Small Test"

Moved the attached songs into the folder called "Small Test".  

Change my music folder in SqueezeCenter to "Small Test" and rescan library 

SqueezeCenter shows a single album called Greatest Hits with the Grassroots artwork.

-When you open that, you see both the Grassroots and the Tom Petty tracks.

-Locate by artist, you will see both artists listed.

-If you open Tom Petty, you can see the Greatest Hits album, but with the Grassroots artwork.  

-If you open that album up, it shows the Tom Petty song with the correct artwork and metadata.