The content discrepancies of the selected church singings to Saint Equal-to-the-Apostles Grand princess Olga

The article contains the analysis of some orthodox church singings to Saint Equal-to-the-Apostles Grand Princess Olga. In the result of comparative analysis of the discrepancies in sources of the church service to Saint Olga of XV-XX centuries it became possible to reconstruct the original content of particular church singings and correct the content mistakes in the text of church service used at the present time. The church singings in the article are accompanied by cultural-historical and stylistic comments.