"Henriette Sontag, born Gertrud Walpurgis Sontag, and after her marriage entitled Countess Rossi (3 January 1806 – 17 June 1854), was a German operatic soprano of ...
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great international renown. She possessed a sweet-toned, lyrical voice and was a brilliant exponent of florid singing." - (en.wikipedia.org 08.11.2019)