It's a free utility that lets you add ID3 tags to every MP3 files in a folder. Choose the directory that contains your MP3 files, then pick from one of three ways the MP3 files are formatted. Type in any extra global information, if any, you'd like to apply to the ID3 tags such as year, genre, and comments. Then when you press the Go button, the program collects information from the file names, and adds ID3 tags with the collected information to all MP3 files in the chosen folder and its subfolders.