http://userbase.kde.org/Applications/Multimedia says that Kid3 is "An MP3, Ogg/Vorbis and FLAC tag editor". Unfortunately, that's all it says. We urgently need someone who uses the app to help us write about it. You don't have to know mediawiki syntax - of course it's nice if you do - as you can write plain text and we'll do the rest. If you can upload a few screenshots as well, that's even better. You can get all the help you need either here or by joining irc.freenode.net #kde-www, or by webchat.freenode.net in your favourite browser.

I usually use Amarok for that, but I've used Kid3 a few times, and keep it installed. I'll try to add at least *something* there

That's great, thanks. Anyone else can add to it later. Feel free to test it in the http://userbase.kde.org/Drafts:Drafts section if you are not used to mediawiki syntax. We'll help.