Lyrics: Can you hear them? They talk about us telling lies well that's no surprise?

Questions

Which wife of Ahasuerus of Persia risked her life to save her people from Hamans plot to have them killed?

From which opera does the aria O Fortuna come?

What was the name of the demarcation line proposed in 1919 which formed the basis for the Soviet-polish border after the second world war?

In 1969 which singer recorded a best selling album during a television documentary at San Quentin prison?

How did racey Emin shock the art world in 1999?