EasyTAG is a utility for easily and quickly viewing, editing and writing
the ID3 tags of your MP3 files, using a nice GTK+ interface.

Some of EasyTAG's features:
o View, edit, write tags of MP3, MP2, FLAC files (supporting
  ID3v2.3 and ID3v1.x specifications) and OGG files
o Auto tagging: parse filename and directory to complete
  automatically the fields (using masks)
o Ability to rename files from the tag (using masks) or by
  loading a txt file
o Process all files of the selected directory
o Ability to browse subdirectories
o Recursion for tagging, removing, renaming, saving...
o Read file header informations (bitrate, time, ...) and display them
o Auto completion of the date if a partial is entered
o Undo last changes
o Ability to process fields of tag and file name (convert letters
  into uppercase, downcase, ...)
o A tree based browser
o A list to select files
o A playlist generator window
o A file searching window