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In page Erna Spoorenberg:

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She was born in Yogyakarta, Java, Dutch East Indies (now Indonesia). As a child, she studied the violin and singing. At the age of 14, she studied under Isa Neuhaus, a singer with the Düsseldorf Opera (who was later transported and killed by the Nazis). Spoorenberg then studied singing under Aaltje Noordewier until she was 17, whilst continuing her violin lessons under Julius Röntgen. At the conservatory, she decided to pursue singing in preference to the violin. In 1947, she made her debut on Radio Hilversum,[1] singing Mozart's motet Exsultate, jubilate.[citation needed]