The monograph is devoted to a general theoretical study of relations between the state and the church, which are based on the concept of a "symphony of the authorities." It has been proven that the symphonic model of relations is characteristic only for the state and the Orthodox Church. The conceptual foundations of the tradition of bringing to life the "symphony of the authorities" are revealed. The need to use the concept of "symphony of the authorities" in reforming relations between the state and the church is justified.