Can Banshee fix music metadata information?
If you have a Last.fm account, try the Last.fm Fingerprint Extension 
for Banshee.
After installing this extension, enable it in Banshee by going to Edit > Preferences > Extensions and checking the box next to Last.fm Fingerprint. With this extension enabled, you can right click on any song in your library and choose "Get Information from Track Fingerprint" which will find the song on Last.fm and fix your local metadata if it is incorrect.
There is standalone program for that (not Banshee) - Picard, in Ubuntu repos. http://musicbrainz.org/doc/MusicBrainz_Picard