Church music in Scotland includes all musical composition and performance of music in the context of Christian worship in Scotland, from the beginnings of Christianisation in the fifth century, to the present day. The sources for Scottish Medieval music are extremely limited due to factors including a turbulent political history, the destructive practices of the Scottish Reformation, the climate and the relatively late arrival of music printing. In the early Middle Ages, ecclesiastical music was dominated by monophonic plainchant, which led to the development of a distinct form of liturgical Celtic chant. It was superseded from the eleventh century by more complex Gregorian chant. In the High Middle Ages, the need for large numbers of singing priests to fulfill the obligations of church se