For the past 30 years—as a parishioner, pastor, songwriter, musician, and now seminary professor—I have witnessed what some have called the "worship wars" raging in our churches. Many churches continue to be torn asunder because of questions like these: Shall we sing "traditional" hymns or "contemporary" choruses, or both? Shall we accompany our singing with organ and piano only, or with guitars and, gasp, even drums? As we sing, shall we lift our hands or only our voices? Shall we read our lyrics by looking into a hymnal or by looking up at text projected on a screen? We desperately...