Nietzsche describes in this short work why he parted ways with his one-time idol and friend, Richard Wagner. Nietzsche attacks Wagner's views, expressing disappointment and frustration in Wagner's life choices (such as Nietzsche's mistaken belief that Wagner had converted to Christianity, perceived as a sign of weakness). Nietzsche evaluates Wagner's philosophy on tonality, music and art; he admires Wagner's power to emote and express himself, but largely disdains what Nietzsche calls his religious biases.