Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Henriette Sontag (3 January 1806 17 June 1854) was a German operatic soprano of great international renown. She possessed a sweet-toned, lyrical voice and was a brilliant exponent of florid singing. Sontag was born at Koblenz as Gertrude Walpurgis Sonntag. She made her début at the age of 15. In 1823 she sang at Leipzig in Carl Maria von Weber's Der Freischütz and in December of that year created the title role in his Euryanthe. Her success was immediate, and in 1824 she went to the Königstädter Theater, Berlin. She was invited to be the soprano soloist in the first performances of Beethoven's Symphony No. 9 and Missa Solemnis on 7 May 1824; she was only 18 years old at the time.