《第9小提琴奏鳴曲》，作品47，別稱《克羅采奏鳴曲》（法語：Sonate à Kreutzer），是路德維希·范·貝多芬於1802年至1803年間創作的小提琴奏鳴曲，發表於1805年。[1]貝多芬並未給這部作品定調（參見右邊的封面圖），但它通常被稱為《A大調第9小提琴奏鳴曲》。
克羅采奏鳴曲以其所需的小提琴演奏技巧、深沉熱烈的感情和近四十分鐘的演奏時長而聞名。作品中所蘊涵的感情豐富，第一樂章所表達的是憤怒，而第二樂章是沉思的，第三樂章則表現出歡樂蓬勃的氣氛。
https://www.youtube.com/watch?v=mUWcyDEvsYA
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《克羅采奏鳴曲》(附魔鬼) 許海燕譯 台北：志文，1997
The Kreutzer Sonata (Russian: Крейцерова соната, Kreitzerova Sonata) is a novella by Leo Tolstoy, named after Beethoven's Kreutzer Sonata. The novella was published in 1889, and was promptly censored by the Russian authorities. The work is an argument for the ideal of sexual abstinence and an in-depth first-person description of jealous rage. The main character, Pozdnyshev, relates the events leading up to his killing his wife; in his analysis, the root cause for the deed were the "animal excesses" and "swinish connection" governing the relation between the sexes.
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During a train ride, Pozdnyshev overhears a conversation concerning marriage, divorce and love. When a woman argues that marriage should not be arranged but based on true love, he asks "what is love?" and points out that, if understood as an exclusive preference for one person, it often passes quickly. Convention dictates that two married people stay together, and initial love can quickly turn into hatred. He then relates how he used to visit prostitutes when he was young, and complains that women's dresses are designed to arouse men's desires. He further states that women will never enjoy equal rights to men as long as men view them as objects of desire, yet describes their situation as a form of power over men, mentioning how much of society is geared towards their pleasure and well-being and how much sway they have over men's actions.
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."
Later acquitted of murder in light of his wife's apparent adultery, Pozdnyshev rides the trains seeking forgiveness from fellow passengers.