As divisive and destructive as the Civil War was, the era nevertheless demonstrated the power that music could play in American culture. Popular songs roused passion on both sides of the Mason-Dixon line, and military bands played music to entertain infantry units-and to rally them on to war. The institution of slavery was debated in songs of the day, ranging from abolitionist anthems to racist minstrel shows. Across the larger cultural backdrop, the growth of music publishing led to a flourishing of urban concert music, while folk music became indelibly linked with American populism. This...