Hard Drive Deletion Masacre

I am making an effort to clean up my external hard drive. A couple of weeks ago I was looking through the drive and found that many of the files had duplicate entries. After that I looked through random folders to see if it was a drive-wide problem, or just in a couple of folders. As far as I can tell so far, almost every folder has 2 copies of every file.

I have made it through the A's in my music so far and it took a little less than a half hour.

Anyone know how to delete duplicate files without going through them yourself to find them?