Deleting Duplicate File Entries?

[Moosbrugger]

I just set up my music files on a late 2014 Mini running Mojave. The files are on an external drive.  I plugged it in, and in iTunes, told it to add the files. (Not import.).  It processed all the files and crested the .itl file.  But many songs are in iTunes  twice or even three times.  There’s only one file, but the song name appears two or three times.  I can highlight the extras and delete, but with over 10,000 songs, this will take forever.  
is there a way to delete all the duplicate song names(but not the actual files)?   Or should I delete the .itl file and redo y the the process correctly? 

[DougAdams]

See here:

https://dougscripts.com/itunes/2014/02/new-scan-for-double-entries/

https://dougscripts.com/521