I thought I would start off with a program like this:
Its called the Duplicate Song Finder/Deleter. It searches though a folder of your choice, and displays all the binary-identical files for you to easily and quickly delete.
This requires .NET 4.0 to run available at Microsoft: .NET 4.0
And of course, the download to my little program: Here
Typically scanning is based on the speed of your processor / size of the music file being scanned. My computer does about 10 songs a second.
At this point pressing “Delete checked items” removes the songs that are checked.
Pretty easy huh?