The Apple iPhone 5, 5c and 5s sync music from the iTunes 11 library, so if you have duplicate songs on your iPhone, you also have them in iTunes. Using iTunes' Show Duplicate Items feature, you can locate and manually remove duplicate songs on your iTunes music library. Once the library is cleansed, you need only sync iTunes with your iPhone to remove duplicates from your iPhone as well.
Connect your iPhone to your computer using the USB data/charging cable and open your Music library in iTunes.
Click "View" and then click "Show Duplicate Items" to display duplicates based only on the song title and artists. This option might display nonduplicate items, such as different song versions that appear in different albums. For greater precision, hold the "Shift" key, click "View" and select "Show Exact Duplicate Items" to check that the duplicate songs also come from the same album. Either option shows both copies of the song, so you can't simply delete all the songs you find.
Hold the "Ctrl" key and click each duplicate you wish to delete.
Click "Edit" and then "Delete." Confirm your selection if necessary.
Click your iPhone from the device list, click "Music" and select "Sync" to sync your library using your existing sync settings.
Information in this article applies to iTunes 11 and iPhones running iOS 7. It may vary slightly or significantly with other versions or products.
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