De Vrijbuiters (schlager trio, later duo)

De Vrijbuiters...
There are two Dutch bands by this name:
1. This artist, a schlager trio, later duo. If there are two or three people on the cover and one of them has an accordion in the hands, this is the correct artist.
Releases of this artist are usually released by VNC (Vincent Produkties) or some sublabel.
2. A larger band with singer Ben Verdellen, who is mentioned most times on the cover.
The label for this artist is usually Onger Os.