iTunes album cover is not the correct cover for that album
You can look for covers yourself (i.e. on Amazon or w/ Google Image Search) and copy &amp; paste them in the "Get Info" dialog (select all songs of an album, press Cmd-I, paste the image into the "Artwork" area).

There are tools like CoverScout which automate these tasks which is feasible if you have a large music library w/ lots of broken covers.