Download Clone Files Checker: https://www.clonefileschecker.com
Now launch the software and click the Add button to add all the directories you want to scan.
Select Custom and Music to limit the scan for duplicate music only.
Hit the Start Search button to fetch dupe-songs.
CFC will show you the scan results, select Review & Fix.
You will now be seeing the duplicates identified in a List. Note the audio player at the far-right that helps you play songs if you want to check them for some reason.
Click Select Duplicates and choose which type of file you want to keep from each duplicate group.
The final step is to click Select Action and choose to purge the duplicate music or move it to a folder of your choice.