What form of entertainment are Martha and Königskinder both performed?
Martha (opera) Martha, oder Der Markt zu Richmond ("Martha, or The Market at Richmond") is a "romantic comic" opera in four acts by Friedrich von Flotow set to a German libretto by Friedrich Wilhelm Riese and based on a story by Jules-Henri Vernoy de Saint-Georges.
Danish Revue Museum The Danish Revue Museum (Danish: Det Danske Revymuseum) is based in a former country house on Allégade in the Frederiksberg district of Copenhagen, Denmark. It is dedicated to the Danish Revue tradition as well as more generally to the history of humorous entertainment in Denmark.