If there are some duplicate songs in iTunes, you may listen to the same song for more than once. This is a bit annoying sometimes. In order to resolve how to delete duplicates in iTunes, you can read the contents shown below.
1. Run iTunes on computer and ensure it is the latest version. Click on the "Music" panel in the left sidebar. And then you need to tap the "View" button in the toolbar and then choose the option of "Show Duplicate Items" to click on.
2. The duplicate songs will shown in the right part of the interface. Choose the duplicate item that you want to remove from iTunes and right-click on it. After that, click on the "Delete" button in the menu.
3. Click on "Done" button after you delete the duplicate song.
You need to repeat the same deleting step until you remove all the duplicate songs. After you deal with how to delete duplicates in iTunes completely, you can listen to iTunes songs happily and at ease. There is no need for you to worry about listening to the same songs once and once again.
For more details, check: How to Delete Duplicate Songs in iTunes
Fix your iTunes by just clicking "View > Show Duplicate Items" one-by-one manually or google some tools to do it automatically:
Google
That's easy, but still time consuming. Click on the list icon, and then on the file menu click show duplicates. On the menu bar that shows Name, Artist, etc right click and look for Date Added and click on it to add to the bar. When you click on that afterwards, it will show which was added most recently, or longest ago (depending on how many times you click it) and that can narrow it down tremendously
What OS you use..
if it's windows.. please google
http://www.google.co.in/search?q=how+to+delete+duplicate+mp3+files&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
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No, it's Mac OS X.
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