Again this looks from a MusicBrainz perspective and finds MusicBrainz releases that have only had one song matched up with a song in our collection. Since most releases contain multiple songs this generally indicates these songs have been matched to a completely incorrect release. This is a common problem with some tag editors that do not prevent songs in an album being split into multiple albums when matching. This is not possible within SongKong unless you change the options for a special case such as identifying songs for a DJ set and haivng no interest in their album information.