The essays in the anthology Liturgical Organ Music in the Long Nineteenth Century: Preconditions, Repertoires and Border-Crossings deal with various forms of liturgical organ music and liturgical organ-playing in the long nineteenth century: solo repertoires, accompaniment of congregational singing, plainchant and other liturgical vocal music, as well as non-liturgical organ music echoing liturgical practices. Important thematic strands in the volume include: Historical preconditions: the forms and practices of organ music in relation to the various kinds of liturgical singing, influential liturgical and aesthetic ideals, as well as theological, philosophical, ideological and social contexts; Border-crossing: how liturgical-musical practices and repertoires transcended confessional, regional and national boundaries. Special attention has been given to the central, northern and eastern regions of Europe.