Olivier Messiaen was a 20th Century French composer. During World War II, he was taken as a prisoner of war by the Nazis and spent a good amount of time in a Nazi prison camp, and it was during this time that he composed "Quartet for the End of Time."
The piece was even first performed in a German prison camp.
It is in eight movements, and it expresses the perception that the world around him was ending. A lot of people likely thought that the Nazis were bringing about the end of all things, and hope is a rare commodity in a Nazi prison camp.
Here I've included only one of the movements, this one titled "Praise to the Eternity of Jesus." Keep in mind that this was composed and first performed while he was a prisoner of war. The human mind never ceases to amaze me.