Eugene Onegin (Евгений Онегин in Russian, Yevgeny Onegin or Evgenij Onegin in transliteration) is an opera in three acts by Pyotr Ilyich Tchaikovsky to a Russian libretto by Konstantin Shilovsky and the composer, based on the novel of the same name by Aleksandr Pushkin. First performance: Malyi Theatre, Moscow, 1879.
Eugene Onegin is a well-known example of lyric opera; the libretto very closely follows Pushkin's original, retaining much of his poetry, to which Tchaikovsky adds music of a dramatic nature. The story concerns a selfish hero who lives to regret his blasé rejection of a young woman's love and his careless incitement of a fatal duel with his best friend. There are a several recordings of it, and it is regularly performed.
Scene 1: The ballroom of the Larin house Tatyana's name-day party. Onegin is irritated with the country people who gossip about him and Tatyana, and with Lensky for persuading him to come. He decides to revenge himself by dancing and flirting with Olga. Lensky becomes extremely jealous. Olga is insensitive to her fiancé and apparently attracted to Onegin. There is a diversion, while a French neighbour called Monsieur Triquet (tenor) sings some couplets in honour of Tatyana, after which the quarrel becomes more intense. Lensky renounces his friendship with Onegin in front of all the guests, and challenges Onegin to a duel, which the latter is forced, with many misgivings, to accept.
(We appreciate Wikipaedia's contributions in the descriptions here)