Please note: The main titles of the albums are "Hast Du mich vermisst?", ":Duett", "Weltunter", "Aus der Tiefe" and "Requiembryo". What you see here is the usage of the style rule [http://wiki.musicbrainz.org/SeriesNumberStyle|"SeriesNumberStyle"] because they have subtitles "Der schwarze Schmetterling, Teil I" to V. We know this looks ugly but that's how it is supposed to be, so please don't change it.