The first part opens with an overture, or rather orchestral prelude, of majestic chords, leading to a short fugue, developed with severe simplicity and preparing the way for the accompanied recitative, "Comfort ye My People," and the aria for tenor, "Every Valley shall be exalted," which in turn leads to the full, strong chorus, "And the Glory of the Lord shall be revealed,"--the three numbers in reality forming one. The prophecy is announced, only to be followed by the human apprehension in the great aria for bass ("But who may abide the Day of His coming"), written in the Sicilian pastoral style,--a form of which, Burney affirms, Handel was very fond. The aria leads to the exquisitely constructed number, "And He shall purify," a fugued chorus closing in simple harmony. Once more the prophet announces, "Behold, a Virgin shall conceive," followed by the alto solo, "O Thou that tellest," which preludes a chorus in the same tempo. The next aria ("The People that walked in Darkness"), with its curious but characteristic modulations, leads to one of the most graphic fugued choruses in the whole work ("For unto us a Child is born"), elegantly interwoven with the violin parts, and emphasized with sublime announcements of the names of the Messiah in full harmony and with the strongest choral power. The grand burst of sound dies away, there is a significant pause, and then follows a short but exquisite Pastoral Symphony for the strings, which with the four succeeding bits of recitative tells the message of the Angels to the Shepherds on the plains of Bethlehem. Suddenly follows the chorus of the heavenly hosts ("Glory to God"), which is remarkably expressive, and affords sharp contrasts in the successive clear responses to the fugue. The difficult but very brilliant aria for soprano, "Rejoice greatly," the lovely aria, "He shall feed His Flock," originally written entire for soprano, in which Handel returns again to the pastoral style, and a short chorus ("His Yoke is easy"), close the first part.