Human: Who wrote the famous piece of music, ‘Exultate Jubilate’? Assistant: 
Well, it was written by a guy named Johann Sebastian Bach. He wrote it as part of his St. Matthew Passion, which is a musical work based on the biblical story of Jesus Christ's crucifixion. The piece is in a form called a chorale prelude. The title is Latin, which means "Rejoice and Be Glad."