Why does iTunes Duplicate Songs When Importing
The issue that iTunes duplicates songs when importing is quite common and many users are not clear on the reasons for it. In order to clear up this confusion for iTunes users, here are some main causes of this trouble.
1. When you find your iTunes duplicates songs when importing to the library, it may result from improper settings of your program. You may have checked the options of "Keep iTunes media folder organized" and "Copy files to iTunes Media folder when adding to library". Thus, iTunes will repeatedly import a folder that is outside that iTunes Media folder into the library.
2. If the folder you add to iTunes library already has several duplicated songs, iTunes will import in all of them. Thus, you will find them duplicated in iTunes library.
3. If the songs you add to iTunes are untagged, iTunes will organize them all into "Unknown Artist/Unknown Album" and set the music name to "Filename". You will be unable to identify the song you need, for their name are almost the same.
4. iTunes does not have the feature to monitor your media folders when you import songs to the library. It just has trouble in detecting what is already on the library. This is one disadvantage of using iTunes itself to import songs.
Remove Duplicates after Importing with iTunes
Apart from avoiding duplicates before and in the process of importing, you can also use iTunes to remove duplicates after the importing. This aim can be achieved simply with the following steps.
1. Run iTunes on your computer and then click on "File" menu in the toolbar. Then you need to hit on "Library> Show Duplicate Items" in order.
2. You will see a list of all duplicates displayed in the right part of the iTunes screen. You can then click on a track or hold down the "Ctrl" key while hitting on multiple tracks to choose them.
3. When you have selected the items, you can click on "Song> Delete from Library" to remove the songs you have selected. The duplicated songs will disappear immediately from the iTunes interface. Thus, your iTunes library will be much clearer.
You should know that iTunes sometimes can confuse different mixes and slight variations shown in different albums. Therefore, you'd better make sure what you are removing is actually a duplicated and not a remix or version from a different album.
For more details, check: Why does iTunes Duplicate Songs When Importing