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AVG PC TuneUp - Peak performance for your PC. Keeps it going for longer. - More Speed Turbo Mode
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.
Duplicate Cleaner - Duplicate Cleaner: the fastest and most popular tool for finding duplicate files. Over 1 million downloads: Get your copy now! Free and Pro versions available.
TuneUp - TuneUp makes your music fresh and clean!
FSlint - FSlint is a utility to find and clean various forms of lint on a filesystem. I.E.
SongGenie - SongGenie analyzes, identifies and repairs your mp3 tags and names.