The German soprano Elisabeth Rethberg (22 September 1894 - 6 June 1976) was a soprano active from the early 1920s to the 1940s. Some hailed her as the greatest singer of her day. While she did not break any new ground dramatically or vocally, she deployed her stunningly beautiful lyric voice with such focus that she never seems obscured in recordings by either large voices or loud orchestras. Wikipedia
The definitive Wikipedia entry for Elisabeth Rethberg. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Elisabeth_Rethberg