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In page Wilma Landkroon:

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Her biggest hit was the 1968 song Heintje, bau ein Schloss für mich, which gained notoriety in the Netherlands and Germany. After this, she had many successes in Netherlands and Germany during the years 1969 and 1970 (see Discography). When Klaus Lorenzen became the producer of the young singer, she started to record songs in different languages (including English and Japanese) and had international chart successes (“Tulips from Amsterdam”; “Lavender blue”). After 1971, Wilma was a star only in the Netherlands, and some years later she became nearly forgotten.[citation needed]