That would be different styles of Orthodox chant, on which he drew considerably in a piece that remains within its liturgical tradition while animating it with fine choral writing.
He was also fond of Russian Orthodox chants.
Nevertheless it was already used for Orthodox chant and not for compositions in Ottoman makam genres.
For each of this nations the tradition of Orthodox chant had to be redefined and the introduction of printed editions was an important part of it.
Nevertheless, he retained a love for Russian folk song and Orthodox chant his entire life.
Thus Tchaikovsky became the first major composer to use traditional Russian Orthodox chants as a basis for an entire liturgical cycle.
Father Sergei has taken to playing Russian Orthodox chants on a record player to liven up his services, especially the weddings.
The solemn secondary theme is based on a baptismal hymn from the repertory of Russian Orthodox chant.
Thematic material is often related to Orthodox chant.
It is used in different traditions of Orthodox chant until today ( Neobyzantine Octoechos).