This is an open access title. It is available to read and download as a free PDF version on Oxford Academic and is made available under a Creative Commons Attribution 4.0 International licence. Defining Deutschtum: Political Ideology, German Identity, and Music-Critical Discourse in Liberal Vienna offers a nuanced look at the intersection of music, cultural identity, and political ideology in late-nineteenth-century Vienna. Drawing on an extensive selection of writings in the city's political press, correspondence, archival documents, and a large body of recent scholarship in late Habsburg cultural and political history, author David Brodbeck argues that Vienna's music critics were important agents in the public sphere whose writings gave voice to distinct, sometimes competing ideological positions. These conflicting positions are exemplified especially well in their critical writings about the music of three notable composers of the day who were Austrian citizens but not ethnic Germans: Carl G