File:Erna Sack.jpg

Summary
German soprano Erna Sack in a promotional photograph from 1956.

Fair use in Erna Sack
The image linked here is claimed by Wikipedia editor NewYork1956 to be used under fair use as:
 * 1) It is an image of a historically significant figure;
 * 2) It is of much lower resolution than the original (copies made from it will be of very inferior quality);
 * 3) The image is only being used for informational purposes;
 * 4) Its inclusion of the image adds significantly to the article;
 * 5) The subject in the image is dead, and it is thus believed that there are no free equivalents.