CDDB is the Gracenote database that many applications, including iTunes, use to obtain artist, album and track information when an audio CD is imported. If you're going to be releasing your CD for sale, you'll want to insert a copy of your CD (do not import it, just let it mount in iTunes), edit all the information so that it's correct as regards artist name, album name, track names, genre, etc., and then use the Submit Track Names command. That way when people who buy your CD import it into iTunes, they'll get all the correct information.
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