Duplicate songs in iTunes
How do you either delete or stop iTunes from duplicating music tracks?
MacBook Pro with Retina display
How do you either delete or stop iTunes from duplicating music tracks?
MacBook Pro with Retina display
I can't answer for stopping, but I have a fix:
Go to "View" (the tab at the top, dropdown), and press 'Hide Duplicate Items'.
If you go to the "Songs" tab in iTunes Music and click View > Show Duplicate Items from iTunes' menu, you can see all the duplicates you have and selectively delete the copies you wish to remove.
Duplicate songs in iTunes