Like many people, I have a huge mp3 collection. Many of the ID3 tags (the metadata like artist, song title, album, etc) in those files are incorrect, so I started looking for a way to batch edit large numbers of mp3s. What I have started using is TigoTago [tigotago.com], which is freeware. TigoTago can also manage other types of files (avi, wav, wma, wmv, and asf).
You can select a directory of files to edit, and then batch edit them in many different ways:

Typically, I have renamed the files from the tags or created new tags from the filenames, but as you can see, there are a bunch of other options (including getting tag info from online databases).
If you choose to create new tags from filenames, you are asked to enter in a mask to be applied:

In this particular case, my files have a dash in between the artist and song title, and it warns me if it finds more than one dash in the filename.
After renaming the files or rewriting the tag information, you can review the changes in the application before the changes are actually made. This is handy as I frequently make a lot of mistakes.

The ones in beige are the ones that have been modified. And writing out hundreds of files doesn't take much time at all.
There are currently two versions available for download: 1.0 and 2.0.0.3 beta. Each also requires you to install a version of the .NET framework. I already had version 2.0 of the .NET framework installed for another application, so I chose to use the beta version of TigoTago (TigoTago 1.0 requires version 1.1 of the .NET framework). On the TigoTago download page are links to the install files for the .NET framework (which are also free).
Anyway, this software does everything I have wanted it to do, and it's free! Managing my mp3 collection is way easier now.



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