via Faith + Theology
If your congregation sings only Hillsong choruses, then their emotional repertoire will be limited to about two different feelings (God-you-make-me-happy, and God-I’m-infatuated-with-you) – considerably less even than the emotional range of a normal adult person. It is why entire congregations sometimes seem strangely adolescent, or even infantile: they lack a proper emotional range, as well as a suitable adult vocabulary. But in the psalter one finds the entire range of human emotion and experience – a range that is vastly wider than the emotional capacity of any single human life.
Just to stick with Hillsong as an example: for a congregation to go from singing Hillsong to singing the psalter would be like seeing Shakespeare’s plays after you’ve only ever watched sitcoms – it would be a shock to discover that human beings can be so large, and that they come in so many different varieties. Nobody has ever felt the way Hamlet feels, or felt so much: that’s exactly what makes Hamlet important.