chunk: After he meets and marries his wife, periods of passionate love and vicious fights alternate. She bears five children, and then receives contraceptives: "The last excuse for our swinish life -- children -- was then taken away, and life became viler than ever." His wife takes a liking to a violinist, Troukhatchevsky, and the two perform Beethoven's Kreutzer Sonata (Sonata No. 9 in A Major for piano and violin, Op. 47) together. Pozdnyshev complains that some music is powerful enough to change one's internal state to a foreign one. He hides his raging jealousy and goes on a trip, returns early, finds Troukhatchevsky and his wife together and kills his wife with a dagger. The violinist escapes: "I wanted to run after him, but remembered that it is ridiculous to run after one's wife's lover in one's socks; and I did not wish to be ridiculous but terrible."