I will be discussing the Greek Orthodox religion which I am personally a part of. The music played in the Greek Orthodox Church is Byzantine chant. It used Greek text and took inspiration from “the artistic and technical productions of the classical age, on Jewish music, and inspired by the monophonic vocal music that evolved in the early Christian cities…” (https://www.wsgoc.org/our-faith/music). This music is sung during Church service and prayer.
Agni Parthene (O Virgin Pure) is a chant that is sung when praising the Mother of God and during evening service. This is an example of the Byzantine chant used. It is monophonic and the vocalists are loud to make sure it echoes around the Church. The lyrics are often repeated. The song is slow paced.