Final answer:
The composition 'For Unto Us a Child is Born' is part of Handel's famous oratorio 'Messiah', celebrating the birth of Jesus Christ.
Step-by-step explanation:
The composition 'For Unto Us a Child is Born' is part of Handel's famous oratorio 'Messiah'. Written by George Frideric Handel in 1741, 'Messiah' is one of the most well-known and beloved works in the Western classical music tradition. The piece 'For Unto Us a Child is Born' is a lively choral movement from Part I of the oratorio, and it celebrates the joy and significance of the birth of Jesus Christ.