since early times, Christians have found music a vital means of expression for their acts of worship. Music is the subject of chapter 4. In ancient times and up through today, Christians have used a small number of basic services. The first of these is services of daily public prayer. Within the category of daily prayer, there are various forms, some of which are described in chapter 5. A second type of service focuses on the reading and preaching of scripture and hence is often referred to as the