When Nietzsche dubbed Richard Wagner "the most enthusiastic mimomaniac" ever to exist, he was objecting to a hollowness he felt in the music, a crowding out of any true dramatic impulse by extravagant poses and constant nervous movements. Mary Ann Smart suspects that Nietzsche may have seen and heard more than he realized. In Mimomania she takes his accusation as an invitation to listen to Wagner's music--and that of several of his near-contemporaries--for...