MPFreaker - Imagine a program that automatically fills in the missing information in your music library...
Tune Sweeper - Show duplicates in your Music library. Automatically select which duplicates to keep and delete based on your preferences. Remove duplicates with one-click from your iTunes or Music app library.
Song Sergeant - Song Sergeant intelligently identifies and removes duplicates, renames inconsistently named artists...
TuneUp - TuneUp makes your music fresh and clean!
SongGenie - SongGenie analyzes, identifies and repairs your mp3 tags and names.
Dupe Eliminator for iTunes - iOS, iPad, iPhone, iPod Touch, iTunes, iTunes software, Software for iTunes, mobile iOS apps for iPad, iPhone and iPod Touch. Remove iTunes duplicates. Stream iTunes Music Library. Super iTunes Suite of useful tools.