Discovered an obscure, but very helpful, iTunes feature, and thought I'd share. I knew that you could show duplicate songs (File > Display Duplicates), but it still took awhile to sort out which "duplicates" were different versions of the same song (which I would like to keep). Well, if you hold down the Option key (Shift on WIndows), before clicking the menu, it changes (File > Display Exact Duplicates). It only lists duplicates where the music is actually the same.

I personally still keep multiple copies if they are on different albums, even if they are exactly the same music, because I don't like incomplete albums. But this feature makes it incredibly easy to sort that out.
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