Right Click on the column header at the top of the display and add the field Beats Per Minute to the display (Assumes you aren't using that for anything-99% of us aren't). To do that, in iTunes, got to the Music display. That process will get rid of the files, but NOT the listing in iTunes. Now repeat that for each album with dupes. Pick the one to delete and again 'Show in Finder.' Now comes the sort of scary part-make the assumption that the other tracks in THAT folder are also dupes you want to get rid of.

Then repeat with the other track to see where IT is stored. The cleverest (IMHO) way is to right click on one copy of a duped track in an album, choose 'Show in Finder' and see where it is stored. You want to get rid of the duped tracks, but keep the good Album, so that requires making sure that the tracks for any given Album stay together in that album folder and don't end up in two separate folders. But the challenge is knowing WHICH dupe to delete. I use Gemini, which can be pointed to your Music folder to find dupes. There are products that do a good job of finding dupes.

New itunes repeat song