The name Giuseppe Verdi conjures images of Italians singing opera in the streets and bursting into song at political protests or when facing the firing squad. While many of the accompanying stories were exaggerated, or even invented, by later generations, Verdi's operas—along with those by Rossini, Donizetti, and Mercadante—did inspire Italians to imagine Italy as an independent and unified nation. Capturing what it was like to attend the opera or to join in the music...