(42%) has also remained stable since the mid-1960s. Beliefs The Presbyterian Church (USA) adheres to Reformed theology. The Book of Order of the Presbyterian Church teaches: Worship The session of the local congregation has a great deal of freedom in the style and ordering of worship within the guidelines set forth in the Directory for Worship section of the Book of Order. Worship varies from congregation to congregation. The order may be very traditional and highly liturgical, or it may be very simple and informal. This variance is not unlike that seen in the "High Church" and "Low Church" styles of the Anglican Church. The Book of Order suggests a worship service ordered around five themes: "gathering around the Word, proclaiming the Word, responding to the Word, the sealing of the Word, and bearing and following the Word into the world." Prayer is central to the service and may be silent, spoken, sung, or read in unison (including the Lord's Prayer). Music plays a large role in most PC(USA) worship services and ranges from chant to traditional Protestant hymns, to classical sacred music, to more modern music, depending on the preference of the individual church and is offered prayerfully and not "for entertainment or artistic display." Scripture is read and usually preached upon. An offering is usually taken. The Directory for Worship in the Book of Order provides the directions for what must be, or may be included in worship. During the 20th century, Presbyterians were offered optional use of liturgical books: The Book of Common Worship of 1906 The Book of Common Worship of 1932 The Book of Common Worship of 1946 The Worshipbook of 1970 (spelling is correct) The Book of Common Worship of 1993 For more information, see Liturgical book of the Presbyterian Church (USA) In regard to vestments, the Directory for Worship leaves that decision up to the ministers. Thus, on a given Sunday morning service, a congregation may see the minister leading worship in street clothes, Geneva gown, or an alb. Among the Paleo-orthodoxy and emerging church Presbyterians, clergy are moving away from the traditional black Geneva gown and reclaiming not only the more ancient Eucharist vestments of alb and chasuble, but also cassock and surplice (typically a full-length Old English style surplice which resembles the Celtic alb, an ungirdled liturgical tunic of the old Gallican Rite). The Service for the Lord's Day The Service