聖金口イオアン聖体礼儀
Although Koshetz was mostly known as a conductor, he also did his share of composing and arranging music. In the 1920s, after the creation of the Ukrainian Autocephalous Orthodox Church, Koshetz composed his liturgy, the Divine Liturgy of St. John Chrysostom, as well as ten Ukrainian religious chants. Later in emigration, he composed much more religious music.