iTSfv

iTunes Store file validator is an add-in for iTunes. It is aimed for iTunes users who are keen on maintaining or having the goal of achieving iTunes Store file standard tags for all the tracks in their iTunes Music Library.
iTSfv has many number of visible and hidden features: automatic genre tagging from Last.fm, exporting iTunes Store artwork, downloading Lyrics from Lyricsfly, Synchrocleaning iTunes Music Library, ReverseScrobble - recovering playedCount from Last.fm, automatic rating according played pattern, creating statistics for your music library, and many more...

Fill Track Count, Disc Number and Disc Count
Fill AlbumArtist from Artist tag
Embed Artwork from explorer into tracks without embedded artwork
Copy Folder.jpg to album folders
Backup and restore play count and ratings
Report albums with inconsecutive track numbers
Report tracks with missing tags (Artwork, Track Number, Lyrics etc.)
Capitalize each word of tag and rename file accordingly
Add new tracks to library (manually or by automatically monitoring)
Delete unreferenced tracks from library similarly to iTunes Library Updater