The Hallelujah Chorus is a piece of music composed by George Frideric Handel in 1741. It is part of his oratorio "Messiah" and is one of the most popular and well-known choral pieces in the world. The chorus is composed of four parts and is often performed by a large choir accompanied by an orchestra. The lyrics are taken from the Bible and are based on the words of the prophet Isaiah. The chorus is often used in religious services and is a popular choice for Christmas concerts.