In 1944 inmates of the Terezin concentration camp in Nazi-occupied Czechoslovakia gave a performance of the Verdi Requiem in front of an audience that included high-ranking Nazi officials, including Adolf Eichmann. The Requiem contains the lines:
What dread there will be
When the Judge shall come
To judge all things strictly.
A trumpet, spreading a wondrous sound
Through the graves of all lands,
Will drive mankind before the throne.
Death and Nature shall be astonished
When all creation rises again
To answer to the Judge.
A book, written in, will be brought forth
In which is contained everything that is,
Out of which the world shall be judged.
When therefore the Judge takes His seat
Whatever is hidden will reveal itself.
Nothing will remain unavenged.
What the Jewish choristers at Terezin could not tell the Nazi officials directly -- that one day the the Nazi regime would be judged and their crimes would be avenged -- they were able to communicate obliquely through the words of the Requiem.