Jacob Hamel was the director of the choral group De Joodse Stem and the Jacob Hamel's children choir.
M.H. Gans, Memorboek. Platenatlas van het leven der joden in Nederland van de middeleeuwen tot 1940 (6e bijgewerkte druk; Baarn 1988) 634-635
The children choir was broadcasted on the radio on the tuesday afternoon at 17:00 by the AVRO.
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