Music in its widest definition (sound and silence organized in time) is never absent from Christian worship. The diversity of styles and forms employed both chronologically and synchronically, as well as the varied theological, aesthetic, and sociological positions concerning musical norms evident in every ecclesial community, provides a window into the self-representation and theological positioning of each community and often also of the subgroups and individuals within it. Disputes over the norms of Christian liturgical music are commonplace, most often within but also between various ecclesial communities, and may be analyzed for their theological significance. These norms concern (1) the distribution of musical roles, (2) the style of ...