Messiah (HWV 56), the English-language oratorio composed by George Frideric Handel in 1741, is structured in three parts. The wordbook (also called libretto or text) was supplied by Charles Jennens. This article covers Part I and describes the relation of the musical setting to the text. Part I begins with the prophecy of the Messiah and his virgin birth by several prophets, namely Isaiah. His birth is still rendered in words by Isaiah, followed by the annunciation to the shepherds as the only scene from a Gospel in the oratorio, and reflections on the Messiah's deeds. Part II covers the Passion, death, resurrection, ascension, and the later spreading of the Gospel. Part III concentrates on Paul's teaching of the resurrection of the dead and Christ's glorification in heaven. The popular Part I of Messiah is sometimes called the "Christmas" portion as it is frequently performed during Advent in concert, sing-along, or as a Scratch Messiah. When performed in this way, it usually concludes with "Hallelujah" (chorus) from Part II as the finale. Messiah, the oratorio The libretto by Jennens is drawn from the Bible: mostly from the Old Testament of the King James Bible, but with several psalms taken from the Book of Common Prayer. Regarding the text, Jennens commented: "...the Subject excells every other Subject. The Subject is Messiah ...". Messiah differs from Handel's other oratorios in that it does not contain an encompassing narrative, instead offering contemplation on different aspects of the Christian Messiah: Structure and concept The oratorio's structure follows the liturgical year: Part I corresponding with Advent, Christmas, and the life of Jesus; Part II with Lent, Easter, the Ascension, and Pentecost; and Part III with the end of the church year—dealing with the end of time. The birth and death of Jesus are told in the words of the prophet Isaiah (the most prominent source for the libretto). The only true scene of the oratorio is the annunciation to the shepherds which is taken from the Gospel of Luke. The imagery of shepherd and lamb features prominently in many movements, for example: in the aria "He shall feed His flock like a shepherd" (the only extended piece to talk about the Messiah on earth), in the opening of Part II ("Behold the Lamb of God"), in the chorus "All we like sheep", and in the closing chorus of the work ("Worthy is the Lamb"). Music