EasyTAG is an utility to easily and quickly view, edit and write your audio
files' tags from a nice GTK+ interface.

Its main features include:
o View, edit and write tags of MP3, MP2 files (ID3 tag with pictures), FLAC
  files (FLAC Vorbis tag), Ogg Vorbis files (Ogg Vorbis tag), MP4/AAC
  (MP4/AAC tag), MusePack and Monkey's Audio files (APE tag).
o Can edit many tag fields : Title, Artist, Album, Disc Album, Year, Track
  Number, Genre, Comment, Composer, Original Artist/Performer, Copyright,
  URL and Encoder name.
o Auto tagging: parse file name and directory to automatically complete the
  fields (using masks).
o Ability to rename files and directories from the tag (using masks) or by
  loading a text file.
o Process all of the selected directory.
o Recursion for tagging, removing, renaming, saving...
o Can set a field (artist, title...) to all other files.
o Read file header informations (bitrate, time...) and display them.
o Auto completion of a date if a partial one is entered.
o Ability to process fields of tag and file name (convert letters into
  uppercase, downcase, ...).
o CDDB support using Freedb.org servers (manual and automatic search).
o A tree-based browser or a view by Artist & Album.
o A playlist generator window.