Do you need to clean up your music library? Picard is an open-source
cross-platform music tagger by MusicBrainz. It has the ability to
identify audio files even without any existing metadata.

Picard helps you organize your music collection by renaming your music
files and sorting them into a folder structure exactly the way you want
it. A variety of plugins are available and you can even write your own.
Picard supports a wide range of audio formats and can also lookup an
entire CD for you.

Tagging audio files has never been easier.

Features:

• 
  Multiple formats: Picard supports all popular music formats,
  including MP3, FLAC, OGG, M4A, WMA, WAV, and more.
  
• 
  AcoustID: Picard uses AcoustID audio fingerprints, allowing files
  to be identified by the actual music, even if they have no metadata.
  
• 
  Comprehensive database: Picard uses the open and
  community-maintained MusicBrainz database to provide accurate
  information about millions of music releases.
  
• 
  CD lookups: Picard can lookup entire music CDs with a click.
  
• 
  Plugin support: If you need a particular feature, you can choose
  from a selection of available plugins or write your own.
  
• 
  Scripting: A flexible but easy to learn scripting language allows
  you to exactly specify how your music files will be named and how the
  tags will look like.
  
• 
  Cover Art: Picard can find and download the correct cover art for
  your albums.
  
• 
  Open Source: Picard is licensed under the GNU General Public License 2.0
  or later, and is hosted on GitHub where it is actively
  developed by some awesome developers.