As music collections grow, so do the duplicate songs. Original albums,soundtracks,compilations, all add to the clutter. Removing duplicates from your collection is a breeze with deDuper.
★★★ Superfast: process 20.000 songs in less than 2 minutes ★★★ iTunes 11.x support
★★★ 4.99 $ . Offer ending soon Cheapest duplicate finder in Store ★★★
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deDuper will find your duplicate tracks in 3 easy steps :

1. find duplicate tracks. deDuper will find exact duplicates, near duplicates (same song different time) and near duplicates (same song , different version).

2. Tracks will be gathered in groups of duplicates

3. Delete - remove duplicate tracks from iTunes and move their files to the Trash. You have also the option to create a duplicate playlist and delete the tracks from there (ALt-Delete)