Mozart is one of the most significant figures in the world of music. He is one of the brightest representatives of the so-called Classical era. Mozart’s works are light and grand at the same time. The future legend started creating marvelous works in his childhood. One of the most remarkable peculiarities of the process of creation was Mozart’s ability to create music in his head without using dozens of drafts and sketches (Kinderman 17). This may be the reason why many people call the composer a prodigy and the man who got his inspiration directly from heaven.1 Many people call Mozart as one of the most religious composers as Mozart was a devout Roman Catholic. It is possible to analyze one of his works to understand the way the man and his works were affected by Catholicism. One of the most remarkable works associated with Mozart’s religious beliefs is, of course, Requiem, that was not finished as the composer died. It is possible to state that religion accompanied the music prodigy since the first days of his life. The music prodigy was born to a family of the future music genius, music teacher, and Kapellmeister Leopold Mozart (Keefe 9). Leopold Mozart was a devout Roman Catholic and, hence, he baptized his seventh child on the next day after he was born. It is also a well-known fact that, as a small boy, Mozart could play the music he heard at the church only once. It is important to add that the composer’s father paid a lot of attention to the boy’s religious education, fasting, and so on. Due to the father’s job, the family traveled a lot and visited major European capitals and cities. Rome was one of these capitals. Mozart was acquainted with Pope Clement XIV who invited him and gave him the Chivalric Order of the Golden Spur when the boy was only fourteen (“The Vatican Reveals Wolfgang Mozart’s Papal Honour” par. 7).2 It is also important to add that religion played one of the most important roles in all people’s lives (Mozart was not an exception). People attended churches each week, and they sought for guidance and help. The church was a center of the spiritual life of people in the 18th century. It is important to add that Catholicism still felt the consequences of Reformation, and it always needed something that would glorify the church. Popes paid a lot of attention to people of art and encouraged them to create beautiful pieces devoted to God and the church. Of course, Mozart became one of the artists encouraged and inspired by the Roman Catholic Church. Prior to the analysis of the factors that influenced the work, it is important to focus on details concerning Requiem Mass in D Minor. The piece is written for violins, viola, cello, organ, double bass, timpani, three trombones, two bassoons, two basset horns, and two trumpets. There is also a vocal part. It includes soprano, tenor, bass, and contralto, as well as a mixed choir. The piece contains fourteen movements divided into seven major parts. They are as follows Introitus, Kyrie Eleison, Sequentia, Offertorium, Sanctus, Agnus Dei, Communio. The composer died before he could complete the work. There was only one complete movement (“Requiem aeternam”). The rest lacked for some vocal or orchestral parts. However, even the incomplete piece astounded