Pyotr Ilyich Tchaikovsky composed a Liturgy of St John Chrysostom, Op. 41, in 1880. The Divine Liturgy of St. John Chrysostom is the primary worship service of the Eastern Orthodox Church, with a significant portion involving dialogue between the clergy and choir. Tchaikovsky used many traditional chants commonly used for the Liturgy, with simple chordal accompaniment. When Jurgenson first published the work in Russia, the Imperial Chapel had exclusive rights to church music publication in Russia. Following a legal battle, the publication of such music became open to all.[1]