Erna_Sack
Erna Dorothea Luise Sack (née Weber; 6 February 1898 – 2 March 1972) was a German lyric coloratura soprano, known as the German Nightingale for her high vocal range.
Articles lacking in-text citations from April 2013
Erna Dorothea Luise Sack (née Weber; 6 February 1898 – 2 March 1972) was a German lyric coloratura soprano, known as the German Nightingale for her high vocal range.