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This work contains a narrative about a liturgical chant, its history and various genres and styles. A lot of attention is paid to explaining the theory and practice of various ancient chants. All this helps to understand better the meaning of the phrase "spiritual influence". The second part of the work deals with the practice of the choir directors' (regents') work, the choice of the repertoire and the relationship between the choir director, the choir and the priest. It is about the influence of various musical styles, the tempo and power of the sound of the performed works on the spiritual state of a person. Speaking about the liturgical basis of choir singing in the Orthodox Church, I reveal the concepts of theory and practice. I recall the early Christian practice of psalm chant, traditional singing in an Orthodox church and also modern liturgical singing. The Church Charter is of great importance for understanding the choir singing. The essence of church chant is to convey the meaning of the prayers performed by musical means as fully as possible and transmit them to all those participating in the service, as the choir is the mouth of the worshipers. The challenges facing the Orthodox Church at the present time are not less important than those that faced it a hundred years ago. The future...