June 11, 2013, 4:40 PM — Here's how you can easily see and remove all duplicate songs in iTunes.
1. Open iTunes.
2. Click the View button in the menu bar.
3. Click Show Duplicate Items.
4. You'll see a list of duplicate songs.
5. Hold the Command key and select the songs you want to remove.
6. Drag the songs and drop them into the trash.
Read more: iMore