I used a GREAT tool once, that could easily do this, as well as derive id3 tags from filenames and rename files to meet the tags, and so on.
Regular expressions where supportet and so on.
There must be thousands of similar tools out there.
I searched my old download archive and found various programs, unfortunately I can't remember the great one I used.
Names are:
- id3lib-3.8.0.zip (seems to be for programming purposes)
- mp3tagedit.zip
- mp3tag-setup.exe
- id3tag.zip
Or a programm called "MP3 Commander" maybe?
Sorry really, can't remember and can't be bothered to install and test. Google away!