From Amadeus best clip ever. Mozart's Requiem is one of the most well-known musical compositions in the world, and Confutatis is a very good example of much of the musical technique that Mozart used that made him and many other musicians so successful.
We are in 1791, and Mozart has been seriously ill for over a year. Since he believes he has been poisoned with Aqua Tofana (a very slow poison) and thus sensing his end, he decided to compose his own Requiem.