Diction. Usually words can help you determine what tone the author is using and in turn what mood.
In World War 2, you could help to hide Jews in a sort of sewer. The Government keeps tracks of most Jews, yet you could attempt to hide people, or at least give water, food, or a safe place. It may bring yourself to death back then, yet it would have a possibility to save at least some Jews.
Compound there are two sentences connected by a semicolon, you can tell because they each have their own subject (the musician, she) and their own verb (preform, had).