French girl group Les Provinciales perform 'Gnan Gnan Gnan' live at the Olympia, Paris, 1966, where they were one of the support acts for Hugues Aufray. The song is from their only record, an EP that was released that same year. This is the only video footage I've come across of this short-lived group.
The concert was first broadcast on French TV on July 31, 1966.