. This etude composed in 1831 is one of the most widely circulated. This etude expresses Chopin's inner feelings about the failure of the Warsaw Revolution. Therefore, it was named "Revolution" etude by later generations. In November 1830, less than a month after Chopin left his motherland, the Warsaw Revolution broke out that shocked Poland. Chopin was very excited after hearing the news of the uprising. He couldn't wait to return to his country immediately and join the battle with the people of his motherland. As he said in a letter to his friends, "...Why can't I be with you, why can't I be a drummer!!!" In September 1831, the Warsaw Revolution, which persisted for ten months, was finally suppressed by the Tsarist Russian army. Bloody suppression. At that time, Chopin was on his way to Western Europe. When the bad news came, he almost went crazy. He wrote in his diary: "Ah! God, are you still there? You exist, but you don't give them retribution! Do you think Moscow's crimes are not enough? Or you are a Moscow devil yourself!... I am here with my bare hands. , unable to exert any effort, just sighing and expressing my pain on the piano." Chopin poured all his emotions into music and wrote this famous etude.