The Psalms are divided into five sections, each according to a specific classification. The Psalms are a form of Hebrew poetry, many of which were accompanied by music. The content of the Psalms includes prophecy of Christ, praise to God, and visions of the future Kingdom of God and its glory. The authors went through many different experiences. Many psalms were the result of the writers' feeling of elation in the service of God. Men who were in the depths of despair wrote other psalms. Some psalms relate to the history of Israel, and many are prophetic both of Jesus and of God's future kingdom.