History of making Requiem
The history of composing a choral masterpiece-Requiem is a big mystery up until this day. In 1791, Mozart was already ill when an anonymous man turned up at his door. This stranger told Mozart that he represented his patron, who wanted to remain unknown. This man wanted a Requiem from the Composer. Mozart had a bad feeling about it. Because he was ill, he thought that Requiem would be his "swansong," the last piece he would ever create.
This commission scared Mozart, but he dedicated himself to it. Unfortunately, Mozart only could complete the Requiem, Kyrie movements, and sketch the voice and bass parts for the Dies Irae to the Hostias.
Mozart, One of the greatest composers of all time, died on December 5, 1791. He was only 35 years old. He died before finishing his last commission. Constanze, Mozart's widow, feared that the patron would want the money back, so she asked Joseph Eybler to complete the work. After Eybler, Another composer that worked on the Requiem was Franz Xaver Sussmeyr. With all the completions done by these composers, it became impossible to understand who wrote what.
The anonymous customer was Anton Leitgeb, a man who was stealing music from other composers and using them as his creations.
Regardless of the author of different parts of the Requiem, it is still a masterpiece to all of us. As Beethoven said: "If Mozart did not write the music, then the man who wrote it was a Mozart."
The structure of a Requiem consists of eight sections: Introitus, Kyrie, Sequentia, Offertorium, Sanctus, Benedictus, Agnus Dei, Communio.