Question: Who mothered the hostess of the party where Chopin met George Sand?

full_context: Document 1: Siegfried Wagner: Siegfried Wagner (6 June 18694 August 1930) was a German composer and conductor, the son of Richard Wagner. He was an opera composer and the artistic director of the Bayreuth Festival from 1908 to 1930.
Document 2: Frédéric Chopin: Although the two displayed great respect and admiration for each other, their friendship was uneasy and had some qualities of a love-hate relationship. Harold C. Schonberg believes that Chopin displayed a "tinge of jealousy and spite" towards Liszt's virtuosity on the piano, and others have also argued that he had become enchanted with Liszt's theatricality, showmanship and success. Liszt was the dedicatee of Chopin's Op. 10 Études, and his performance of them prompted the composer to write to Hiller, "I should like to rob him of the way he plays my studies." However, Chopin expressed annoyance in 1843 when Liszt performed one of his nocturnes with the addition of numerous intricate embellishments, at which Chopin remarked that he should play the music as written or not play it at all, forcing an apology. Most biographers of Chopin state that after this the two had little to do with each other, although in his letters dated as late as 1848 he still referred to him as "my friend Liszt". Some commentators point to events in the two men's romantic lives which led to a rift between them; there are claims that Liszt had displayed jealousy of his mistress Marie d'Agoult's obsession with Chopin, while others believe that Chopin had become concerned about Liszt's growing relationship with George Sand.
Document 3: Frédéric Chopin: In 1836, at a party hosted by Marie d'Agoult, Chopin met the French author George Sand (born [Amantine] Aurore [Lucile] Dupin). Short (under five feet, or 152 cm), dark, big-eyed and a cigar smoker, she initially repelled Chopin, who remarked, "What an unattractive person la Sand is. Is she really a woman?" However, by early 1837 Maria Wodzińska's mother had made it clear to Chopin in correspondence that a marriage with her daughter was unlikely to proceed. It is thought that she was influenced by his poor health and possibly also by rumours about his associations with women such as d'Agoult and Sand. Chopin finally placed the letters from Maria and her mother in a package on which he wrote, in Polish, "My tragedy". Sand, in a letter to Grzymała of June 1838, admitted strong feelings for the composer and debated whether to abandon a current affair in order to begin a relationship with Chopin; she asked Grzymała to assess Chopin's relationship with Maria Wodzińska, without realising that the affair, at least from Maria's side, was over.
Document 4: Frédéric Chopin: Chopin's relations with Sand were soured in 1846 by problems involving her daughter Solange and Solange's fiancé, the young fortune-hunting sculptor Auguste Clésinger. The composer frequently took Solange's side in quarrels with her mother; he also faced jealousy from Sand's son Maurice. Chopin was utterly indifferent to Sand's radical political pursuits, while Sand looked on his society friends with disdain. As the composer's illness progressed, Sand had become less of a lover and more of a nurse to Chopin, whom she called her "third child". In letters to third parties, she vented her impatience, referring to him as a "child," a "little angel", a "sufferer" and a "beloved little corpse." In 1847 Sand published her novel Lucrezia Floriani, whose main characters—a rich actress and a prince in weak health—could be interpreted as Sand and Chopin; the story was uncomplimentary to Chopin, who could not have missed the allusions as he helped Sand correct the printer's galleys. In 1847 he did not visit Nohant, and he quietly ended their ten-year relationship following an angry correspondence which, in Sand's words, made "a strange conclusion to nine years of exclusive friendship." The two would never meet again.
Document 5: Frédéric Chopin: With his health further deteriorating, Chopin desired to have a family member with him. In June 1849 his sister Ludwika came to Paris with her husband and daughter, and in September, supported by a loan from Jane Stirling, he took an apartment at Place Vendôme 12. After 15 October, when his condition took a marked turn for the worse, only a handful of his closest friends remained with him, although Viardot remarked sardonically that "all the grand Parisian ladies considered it de rigueur to faint in his room."
Document 6: Tannhäuser (opera): Tannhäuser (; full title Tannhäuser und der Sängerkrieg auf Wartburg, "Tannhäuser and the Minnesingers' Contest at Wartburg") is an 1845 opera in three acts, music and text by Richard Wagner, (WWV 70 in the catalogue of the composer's works) based on two German legends: Tannhäuser, the legendary medieval German Minnesänger and poet, and the tale of the Wartburg Song Contest. The story centers on the struggle between sacred and profane love, and redemption through love, a theme running through much of Wagner's mature work.
Document 7: Luise Willer: Luise Willer (1888–1970) was a German operatic contralto. She made her professional opera debut in 1910 as Annius in Wolfgang Amadeus Mozart's "La clemenza di Tito". She spent most of her career performing at the Bavarian State Opera in Munich. At the Bayreuth Festival, she portrayed Brängane in "Tristan und Isolde". She created roles in several world premieres during her career, including Barbara in Erich Wolfgang Korngold's "Violanta" (1916), Lukrezia in Hans Pfitzner's "Palestrina" (1917), Graben-Liese in Franz Schreker's "Das Spielwerk" (1920), and Herzogin in Pfitzner's "Das Herz" (1931) among others.
Document 8: Cosima Wagner: Cosima Wagner (born Francesca Gaetana Cosima Liszt; 24 December 1837 – 1 April 1930) was the illegitimate daughter of the Hungarian pianist and composer Franz Liszt and Marie d'Agoult. She became the second wife of the German composer Richard Wagner, and with him founded the Bayreuth Festival as a showcase for his stage works; after his death she devoted the rest of her life to the promotion of his music and philosophy. Commentators have recognised Cosima as the principal inspiration for Wagner's later works, particularly "Parsifal".
Document 9: August Conradi: Conradi probably met Liszt in the early 1840s. He served as Liszt's copyist in Weimar in January and February 1844, and he spent 18 months there in 1848 and 1849 at Liszt's instigation. Conradi prepared copies of the initial versions of Liszt's orchestral works, making suggestions on scoring. He also assisted Liszt in assembling a "Programme general" of all the repertory he had played during his virtuoso years. While Conradi was an extremely hard worker, he also possessed a somewhat routine mind. When he received his appointment as Kapellmeister in Stettin in the winter of 1849, his work at Weimar was taken over by the more imaginative Joachim Raff. Nevertheless, Liszt continued to use him as a copyist. In September, 1855 Liszt wrote of his intention to send the score of his "Psalm 13" to Berlin so that Conradi could make a fair copy for the first performance there.
Document 10: Oliver Hilmes: Oliver Hilmes (born 1971 in Viersen, Germany) is a German author who has written several historical biographies. His study of Cosima Wagner, the daughter of the 19th century composer Franz Liszt and his biography of Alma Mahler a Viennese-born socialite, have been translated into English.
Document 11: Frédéric Chopin: Four boarders at his parents' apartments became Chopin's intimates: Tytus Woyciechowski, Jan Nepomucen Białobłocki, Jan Matuszyński and Julian Fontana; the latter two would become part of his Paris milieu. He was friendly with members of Warsaw's young artistic and intellectual world, including Fontana, Józef Bohdan Zaleski and Stefan Witwicki. He was also attracted to the singing student Konstancja Gładkowska. In letters to Woyciechowski, he indicated which of his works, and even which of their passages, were influenced by his fascination with her; his letter of 15 May 1830 revealed that the slow movement (Larghetto) of his Piano Concerto No. 1 (in E minor) was secretly dedicated to her – "It should be like dreaming in beautiful springtime – by moonlight." His final Conservatory report (July 1829) read: "Chopin F., third-year student, exceptional talent, musical genius."
Document 12: Frédéric Chopin: Chopin has figured extensively in Polish literature, both in serious critical studies of his life and music and in fictional treatments. The earliest manifestation was probably an 1830 sonnet on Chopin by Leon Ulrich. French writers on Chopin (apart from Sand) have included Marcel Proust and André Gide; and he has also featured in works of Gottfried Benn and Boris Pasternak. There are numerous biographies of Chopin in English (see bibliography for some of these).
Document 13: Frédéric Chopin: At the age of 21 he settled in Paris. Thereafter, during the last 18 years of his life, he gave only some 30 public performances, preferring the more intimate atmosphere of the salon. He supported himself by selling his compositions and teaching piano, for which he was in high demand. Chopin formed a friendship with Franz Liszt and was admired by many of his musical contemporaries, including Robert Schumann. In 1835 he obtained French citizenship. After a failed engagement to Maria Wodzińska, from 1837 to 1847 he maintained an often troubled relationship with the French writer George Sand. A brief and unhappy visit to Majorca with Sand in 1838–39 was one of his most productive periods of composition. In his last years, he was financially supported by his admirer Jane Stirling, who also arranged for him to visit Scotland in 1848. Through most of his life, Chopin suffered from poor health. He died in Paris in 1849, probably of tuberculosis.
Document 14: Frédéric Chopin: Although this period had been productive, the bad weather had such a detrimental effect on Chopin's health that Sand determined to leave the island. To avoid further customs duties, Sand sold the piano to a local French couple, the Canuts.[n 8] The group traveled first to Barcelona, then to Marseilles, where they stayed for a few months while Chopin convalesced. In May 1839 they headed for the summer to Sand's estate at Nohant, where they spent most summers until 1846. In autumn they returned to Paris, where Chopin's apartment at 5 rue Tronchet was close to Sand's rented accommodation at the rue Pigalle. He frequently visited Sand in the evenings, but both retained some independence. In 1842 he and Sand moved to the Square d'Orléans, living in adjacent buildings.
Document 15: Emma Seehofer: Emma Seehofer (before 1854 – 1912) was a German operatic contralto who was a principal artist at the Bavarian State Opera in Munich from 1854 to 1887. She created the roles of Erda in Richard Wagner's "Das Rheingold" on 22 September 1869 and Schwertleite (one of the Valkyries) in Wagner's "Die Walküre" on 26 June 1870. She was also highly active as a concert singer. After retiring from the stage, she worked as a singing teacher in Munich. She died at Mannheim.
ground_truth: Cosima Wagner
sub_queries: Who hosted the party whre Chopin met George Sand? Answer: Marie d'Agoult
Marie d'Agoult >> child Answer: Cosima Wagner