any powerful software to mass edit ID tag properties of mp3 files

[ahbeng]

any is there any powerful software to mass edit ID tag properties of mp3 files? does such softwares exist?

 

[aCiDz]

I use this - http://www.mp3tag.de/en/

 

[xieyuqi]

I use Tagmaster by AnalogX. It is free.
http://www.analogx.com/contents/download/audio/tagm.htm

 

[A70]

Do they support Unicode? It's frustrating when you want to edit tags for Chinese songs but the tag editor doesn't support.