The discussion concerns questions related to religious aesthetics in W.A. Mozart's church music. Taking a point of departure in thoughts about music for church services at the end of the eighteenth century, Mozart's so-called Lauretan litanies are discussed. He wrote two such litanies, a short and a longer (solemn), both of them during his Salzburg years (1771 and 1772). These works form part of a religious practice in the post-Tridentine Catholic Church, the text possibly going further back in time. The point is to discuss how the music interprets the words of the litany as well as the situation of the litany. Other parts of Mozart's church music production are brought in to the context as well as Lauretan litanies by earlier composers, in particular a seventeenth-century Lauretan litany by another famous Salzburg composer, Heinrich Biber.