Doesnt get them all.

Had several hundred songs on my desktop to be added to iTunes without duplicating what may already be in the library…
It didnt see any of them so chose to manually add them and then check for duplicates.

Wish I could submit screen shots that would show Tune Sweeper finding 30 duplicates and when running iTunes Show Duplicates found over 200.

TS would be worth the fee if it worked but clearly doesnt work as advertised and should be a free app at best.

Check for yourself. Run TS to find duplicates and then run iTunes Show Duplicates.

FlynMac about Tune Sweeper