Question: Who composed the musical works Liturgy of St. John Chrysostom and All-Night Vigil?
Context: The Liturgy of St. John Chrysostom (Ukrainian: Літургія Івана Златоустого , tr.  "Liturhiya Ivana Zlatoustoho") is the musical setting of the Divine Liturgy of St. John Chrysostom by Mykola Leontovych.  Consistent with Orthodox tradition, in which service is sung exclusively a cappella, the piece is set for unaccompanied choir and soloist.  It was first performed in the Mykolaiv Cathedral at the Kiev Pechersk Lavra on May 22, 1919, with Leontovych himself conducting. The St. John Chrysostom Church (Russian: храм Святого Иоанна Златоуста ) It is a Catholic church in Novokuznetsk in Russia.  This church, dedicated to St. John Chrysostom has the distinction of hosting two parishes, one of Latin or Roman rite Byzantine rite and the other formed by the Greco-Roman parish of the Uniate.  His Catholic pastor serves both rites. Saint Nicarete (?  5th century), was a woman of Nicomedia who became a saint as a disciple of St. John Chrysostom.  She left her home specifically to study theology and practice devotion and care for the poor in Constantinople.  She became a follower of John Chrysostom and worked as a physician as well as a healer for the poor.  She cured John Chrysostom of a stomach ailment.  Later, when Chrysostom was sent into exile from Constantinople, she went with him. John Chrysostom ( ; Greek: Ἰωάννης ὁ Χρυσόστομος ), c. 349 – 14 September 407, Archbishop of Constantinople, was an important Early Church Father.  He is known for his preaching and public speaking, his denunciation of abuse of authority by both ecclesiastical and political leaders, the "Divine Liturgy of Saint John Chrysostom", and his ascetic sensibilities.  The epithet "Χρυσόστομος" ("Chrysostomos", anglicized as Chrysostom) means "golden-mouthed" in Greek and denotes his celebrated eloquence.  Chrysostom was among the most prolific authors in the early Christian Church, exceeded only by Augustine of Hippo in the quantity of his surviving writings. The Divine Liturgy of Saint John Chrysostom is the most celebrated divine liturgy (or "mass") in the Byzantine Rite.  It is named after its core part, the anaphora attributed to Saint John Chrysostom, Archbishop of Constantinople in the 5th century. Liturgy of St John Chrysostom, Op. 31 (Russian: Литургия Иоанна Златоуста ), is a musical work by Sergei Rachmaninoff, one of his two major unaccompanied choral works (the other being his All-Night Vigil).  The Divine Liturgy of St. John Chrysostom is the primary worship service of the Eastern Orthodox Church. The Liturgy of St. John Chrysostom (Russian: Литургия святого Иоанна Златоуста , "Liturgiya svyatogo Ioanna Zlatousta ") is an "a cappella" choral composition by Pyotr Ilyich Tchaikovsky, his Op. 41, composed in 1878.  It consists of settings of texts taken from the Divine Liturgy of St. John Chrysostom, the most celebrated of the eucharistic services of the Eastern Orthodox Church.  Tchaikovsky's setting constitutes the first "unified musical cycle" of the liturgy. St. John Chrysostom Church, also known as the Episcopal Church of St. John Chrysostom and the Little Red Church on the Hill, is a historic wooden Episcopal church building located at 1111 Genesee Street in Delafield, Waukesha County, Wisconsin.  Built in 1853, it was designed by noted New York architect Richard Michell Upjohn working with his father Richard Upjohn in what has come to be known as the Carpenter Gothic style of architecture.  Father James DeKoven served as the parish's first rector from 1855 until 1859.  Bishop Jackson Kemper consecrated the building on May 20, 1856.  On February 23, 1972, the building was added to the National Register of Historic Places. The All-Night Vigil for choir" (Russian: Всенощное бдение для хора ", "Vsyenoshchnoye bdyeniye dlya khora ") is an "a cappella" choral composition by Pyotr Ilyich Tchaikovsky, his Op. 52, written from 1881 to 1882.  It consists of settings of texts taken from the Russian Orthodox all-night vigil ceremony. The All-Night Vigil (Pre-reform Russian: Всенощное бдѣніе, "Vsénoshchnoye bdéniye"; Modern Russian: Всенощное бдение) is an a cappella choral composition by Sergei Rachmaninoff, his Op. 37, premiered on March 23, 1915 in Moscow.
Answer: Sergei Rachmaninoff