Bulgarian Movie about (Byzantian and Russian – Western Singing) in the Bulgarian Eastern Orhotox Church – http://www.pravoslavie.bg/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE/%D0%BF%D0%B5%D1%81%D0%B5%D0%BD-%D0%B8-%D0%BC%D0%BE%D0%BB%D0%B8%D1%82%D0%B2%D0%B0/#