In the history of brass instruments, few developments can rival the early nineteenth-century invention of the valve for enduring significance. Nevertheless, the acceptance of valved brass instruments proved controversial, as newspapers and other documents repeatedly attest. Christian Ahrens (Ruhr-Universität Bochum) in his important monograph, Eine Erfindung und ihre Folgen: Blechblasinstrumente mit Ventilen (1986), devotes considerable attention to this heated controversy, as he traces the early use of valved brass instruments in the realms of art music, military music, and Volksmusik. Stressing social and aesthetic issues over the more familiar mechanical aspects, the author draws on a rich body of journalistic source material to detail a compelling reception history.