Ligon Duncan encourages greater use of Scripture in our worship:
The congregation that aims to be biblically directed and informed in its approach to public worship will gather weekly on the Lord’s Day for Bible reading, Bible preaching, Bible praying, Bible singing and biblical observance of the sacraments. These things will be at the core of what they do in public worship. This means the following for biblically-directed congregational services of worship.
They will sing the Bible in public worship (Psalm 98:1, Revelation 5:9, Matthew 26:30, Nehemiah 12:27, 46; Acts 16:25; Ephesians 5:19; Colossians 3:16). This doesn’t mean that we can only sing Psalms or only sing the language of scripture, though this tremendous doxological resource of the church should not be overlooked. What we mean by “sing the Bible” is that our singing ought to be biblical, shot through with the language, categories and theology of the Bible. It ought to reflect the themes and proportion of the Bible, as well as its substance and weightiness. Terry Johnson, again, provides this counsel: “Our songs should be rich with Biblical and theological content. The current divisions over music are at the heart of our worship wars. Yet some principles should be easy enough to identify. First, what does a Christian worship song look like? Answer, it looks like a Psalm. The Psalms provide the model for Christian hymnody. If the songs we sing in worship look like Psalms, they will develop themes over many lines with minimal repetition. They will be rich in theological and experiential content. They will tell us much about God, man, sin, salvation, and the Christian life. They will express the whole range of human experience and emotion. Second, what does a Christian worship song sound like? Many are quick to point out that God has not given us a book of tunes. No, but He has given us a book of lyrics (the Psalms) and their form will do much to determine the kinds of tunes that will be used. Put simply, the tunes will be suited to the words. They will be sophisticated enough to carry substantial content over several lines and stanzas. They will use minimal repetition. They will be appropriate to the emotional mood of the Psalm or Bible-based Christian hymn. Sing the Bible.”