Hey, you can follow this guide to remove duplicate songs from iTunes library:. Or you can try Cisdem DuplicateFinder for Mac to remove iTunes duplicates.
Other features from Cisdem DuplicateFinder
- Locate duplicate images, musics, documents, audio, video, archives, packages and more.
- Built-in preview of the already categorized duplicates and show file metadata to decide which file to delete.
- Fully support many storage devices like internal or external hard drives, cameras, iPods, USB flash drives, memory cards.
- Hide files from scanning again, also support remove files from hidden list.
- Auto removal of duplicates in one go or manual removal of duplicates after your final check.