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As I previously wrote a post about international subtitles, this post will be about international audio tagging and lyrics.
* eyeD3 is a tag management tool allowing to encode tags, cleanly in severeral character encodings including UTF-8.
* LrcShow-x is a free and open-source tool to read lyrics, synced with music on any X terminal.
It allow to view lyrics, download them from Internet and embed them in file using several supported lyrics file format.