The debate in many Reformed circles over worship music is only a small part of the larger question of Reformed liturgies. All sides admit that the New Testament offers relatively little instruction on liturgy, and so the debate over the regulative principle continues with apparently little hope for resolution. In this study, Peter Leithart's key insight reveals a prominent scriptural example of a liturgy that interprets God's commands for worship in ways for more biblically grounded than traditional regulativism allows. King David's tabernacle worship becomes a rich story, not only in respect to liturgical wisdom, but also to the significance of Zion in the fulfillments of the Christian era.