Only because of Wagner (and the rampant “1870 Germany” he represented) did Italian and French musicians, whatever their level of patriotism, feel the need to become stylistic nationalists. Previously the style of Italian music had been the one European style virtually free of self-consciousness – a luxury enjoyed only by the self-confidently topmost, and a testimony to that happy state of security. But as we have just seen, by the end of his career even Verdi had been spooked. Even he needed to situate himself stylistically vis-a-vis the wizard of Bayreuth, and so have practically all composers ever since. Wagner’s own style, as we have also seen, was probably the most self-conscious, self-willed, and deliberately assumed style in the history of European music. Unself-conscious style has not been an option for composers in the post-Wagnerian age, and that may be the post-Wagnerian age’s best definition. (III, 567-568)
Wagner’s influence on the national styles of Germany’s neighbors was no doubt profound, but I wonder if this might be overstating the point slightly. Was Wagner (and what he represented) really the “only” reason Italian and French musicians became stylistic nationalists around this point in time? Further, although Wagner’s style was self-conscious to the extreme, could this not also be said of other major innovators (and myth-makers) of the century? It could easily be argued that Beethoven upped the artistic imperative of the self-willed, self-conscious model even more than Wagner, in fact. The superlatives in this passage make me a bit squeamish; they seem to suggest a strict demarcation of “pre-” vs “post-” Wagner, a sort of “BC” and “AD” stylistic chronology with Wagner at the center. His influence was incalculable – this much we can agree on. Perhaps that’s why such pat attempts to calculate his influence fall flat.