You could also try something like Musicbrainz to straighten out your tags. I find it's good for most all mainstream stuff. It might do 85% of the work for you and then you could use Mp3 Tag Studio 3 to rename the files based on tags. Both are free (Tag Studio is ad-supported unless you pay, but it's not one of these ifested installers a'la Kazaa). HTH.

-Zeke