The Cherubic Hymn is the essential cherubikon (Gr: χερουβικόν), or tune of the holy messengers, sung amid each Divine Liturgy of the year except for the ceremonies of the Presanctified Gifts and those of Holy Thursday and Holy Saturday. It happens after the Gospel perusing and is hindered by the Great Entrance. The Cherubic Hymn was added to the Liturgy of St. John Chrysostom by request of the Emperor Justinian close to the finish of the 6th century.