Book excerpt: The genre of mélodrame à grand spectacle that emerged in the boulevard theatres of Paris in the 1790s - and which was quickly exported abroad - expressed the moral struggle between good and evil through a drama of heightened emotions. The premise of this volume is the idea that the melodramatic aesthetic is central to our understanding of nineteenth-century music drama, broadly defined as spoken plays with music, operas and other hybrid genres that combine music with text and/or image.