Addressing the great apostasy of the Reformed churches in the area of public worship, this book demonstrates that worship is to regulated by the word of God. The issue in the contemporary worship-wars in Reformed and Presbyterian churches is the second commandment. Reformed Worship proves its case from Scripture, the Reformed creeds, and the Reformed tradition. God has not left the manner of his worship to the whims of worship committees or the fancies of the worshipping congregation. There is a right worship of the one, true God. There is also a sinful way of worshipping the true God. Invariably diminished, and eventually lost, in all forms of "progressive" worship is the preaching of the gospel, which God has ordained as the heart of his worship and the chief means of grace to his worshiping people. The book responds to the charge that "traditional" Reformed worship leaves the congregation passive. Since Reformed worship is covenantal, it necessarily calls the congregation to intense activity. But what is this activity? In the course of its examination of biblical, covenantal worship, the work considers such controversal matters as the observance of the Christian holidays, the use of instrumental accompaniment, and exclusive psalmody. Three ministers in the Protestant Reformed Churches in America cooperate in this fresh, informative, and provocative study of the supreme calling of the church: to worship the God and Father of Jesus Christ rightly.