EasyTAG is a GUI tag editor for adding id3 tags with song-name, artists and so on to music files.
YOU DO NOT WANT TO USE THIS PIECE OF SOFTWARE OR HAVE IT INSTALLED ON YOUR SYSTEM. NO.
EasyTAG has a serious BUG that CORRUPTS audio files in a OGG container. Editing tags with EasyTAG versions prior to 2.4.3 and some later versions too probably will therefore destroy your precious music files.
Install kid3. It's not as fancy-looking but it won't totally destroy your entire music collection.