Need suggestions on a freeware program to clear up duplicate files

[W.O.T. Stang]

As the title says, im looking for a *good* program that can sort through the folders i specify (subfolders included) to look for duplicate files of the same name/size. Specifically MP3 files.

I've tried a few freeware ones (noclone, duplicate mp3 finder, abee mp3 duplicate finder) but they seem to find totally unrelated files and want to delete valid non-duplicates.

Any suggestions on what you use/like? Even something that isnt freeware.