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Some of the more important issues that are found:
* broken tags / headers / audio
* duplicate tags / headers
* incorrect placement of tags / headers (ID3V2, ID3V1, LAME, Xing, ...)
* low quality audio
* missing VBR header
* missing track info / cover art
* broken track info / cover art
* missing normalization data
* character encoding issues (for languages other than English)
Some of the fixes and changes that MP3 Diags can do:
* Adding / fixing track info, including album cover; information can be retrieved from several sources: Internet, clipboard, file name, local files, and (obviously) keyboard
* Correcting files that show incorrect song duration
* Correcting files in which the player cannot seek correctly
* Converting characters for non-English names
* Adding composer name to the artist field, for players that don't handle the composer field
* Renaming files based on their fields
* Changing word case for track info
MP3 Diags also has a tag editor with which you can download the album art, including cover from MusicBrainz and Discogs. Another important component is the renaming of files, with which you can easily change the names of the MP3s based on ID3V2 tags.
Download MP3 Diags [Packages available for Windows, Ubuntu, Debian, openSUSE, Gentoo, Fedora, Mandriva and others]
[via ubuntutips]