MP3 Diags is a freeware application that can find and fix over 50 problems related to mp3 files. This can prove to be a useful tool when you have a huge music collection and want to ensure that all the files work correctly.
MP3 Diags scans the files and then lets you edit track / album info, download and embed album art, fix broken track information, tags etc.
- Find broken tags, headers and audio
- Find missing VBR headers, album art, track info
- Find character encoding issues
- Rename files based on fields
- Fix seeking problems
You might also want to take a look at MP3 Gain, which helps to normalize music levels for different files.