This software can let you edit the ID3 tags of MP3 tracks.

Actual Tag Editor will help you fix tags and names of MP3 files for your MP3 player. Quite often these devices search tracks by the details available in the tag. Batch editing features let you edit a large number of tracks and then arrange them appropriately. Title, album, artist information help find the right track in a collection. However, if your tracks do not have these information or have wrong entries then finding a track or arranging them could become impossible. All the tag versions so far are supported, these include ID3v2.2, ID3v2.3, ID3v2.4 and ID3v1 tags. The tool has editing features for editing a group of tags or an individual one. Ability to Cut/Copy/Paste/Delete whole tags. You would be able to rename files based on the tag information. Conversely you could fill tag information from file names.

The interface makes it quite easy for getting the job done. On the left you get the directory structure of your collection. The middle section shows the details of tags of the contents in a folder selected on the left. On the right you have controls for doing the editing of the tag information. On the right click menu too you have access to several functionalities. But what I liked best was the capability to undo things, the mistakes you invariably make! Find and replace and change of case features add value to the editor. If you are music collector like most of us, and do not have a tag editor, this is one tool you need to try.