Software to delete duplicate digital music files

Just an item to consider -- given the very low cost of storage these days I'm not sure why anyone would put much effort into deleting duplicate music files.  I have the odd track here and there that is in more than one spot (i.e., on the original release and then a greatest hits release or a "mix tape" of my own creation, etc.)  In fact, in some situations removing  the file would render an album less enjoyable. So, not anything I'm going to worry about. 

I have recorded a CD more than once, forgetting that I have made previous rips.  The files for each track are then saved and the track is replayed before moving on to the next.  A program that would cull redundant files would be of use

I use a free file transfer program called File-Sync for backing up my photo and music files; in addition to keeping your source in sync with your backups, it also removes duplicate files if you want it to.