Wilma can refer to: 1) Wilma Landkroon (born April 28, 1957, in Enschede, Overijssel) is a Dutch pop singer. At eleven years old, her first top chart success in the Netherlands and Germany was in 1968 the song “Heintje, bau ein Schloss für mich” (Heintje, build a castle for me). After this, Wilma had many successes in Netherlands and Germany during the years 1969 and 1970 (see Discography). When Klaus Lorenzen became new producer of the young singer