The final part from 1791 took on a new direction, as was reflected in the formulation of the title: "Four-part Latin and German choral settings for use by choirs in churches and schools. The first part, or the motet collection, part VI, from Johann Adam Hiller, Ducal Music Director of Kurland, Cantor of St. Thomas School and Music Director of both of the main churches in Leipzig." (additional parts were not published). The volume precedes a foreword, in which Hiller relates why he composed and published the present pieces. Of special interest is the great amount of information about church music and liturgical practice of this time, which he in part could shape, but in the face of whose traditions he also sometimes felt powerless. So this foreword belongs among the most important documents on the living practice of Protestant church music in the last years of the 18th century.