Pollux for iTunes will help you to stop worrying about organizing your music library again
✹ Completely automatic and easy to use
✹ Tags name, artist, album, album art, genre, year, and lyrics
✹ Analyzes the track’s unique fingerprint, so it can never be wrong
✹ No existing track information necessary
✹ Automatically corrects each track’s information as it is added to iTunes

And best of all, it’s completely free! Give it a try!