Question: What Czech operatic contralto had a close partnership with the composer of "The Bartered Bride"?

full_context: Document 1: Bedřich Smetana: Bedřich Smetana (] ; 2 March 1824 – 12 May 1884) was a Czech composer who pioneered the development of a musical style which became closely identified with his country's aspirations to independent statehood. He is thus widely regarded in his homeland as the father of Czech music. Internationally he is best known for his opera "The Bartered Bride" and for the symphonic cycle "Má vlast" ("My Homeland"), which portrays the history, legends and landscape of the composer's native land.
Document 2: Irma Reichová: Irma Reichová (14 March 1859 – 5 June 1930) was a Czech operatic soprano who had an active career appearing in European opera houses during the latter half of the nineteenth century. A dramatic soprano, she was admired for both her musical and acting talent. She is best remembered for appearing in the world premieres of a number of operas by Antonín Dvořák and Bedřich Smetana.
Document 3: Adolf Čech: Adolf Čech (11 December 184127 December 1903) was a Czech conductor, who premiered a number of significant works by Antonín Dvořák (the 2nd, 5th and 6th symphonies, more than any other conductor; other important orchestral works, four operas, the "Stabat Mater"), Bedřich Smetana ("Má vlast", five operas), Zdeněk Fibich (two operas) and other Czech composers. He also led the first performances outside Russia of two operas by Pyotr Ilyich Tchaikovsky and the Czech premieres of seven operettas by Jacques Offenbach. He was also a bass singer and a translator of opera librettos.
Document 4: Antonín Dvořák: Antonín Leopold Dvořák ( ; ] ; 8 September 1841 – 1 May 1904) was a Czech composer. After Bedřich Smetana, he was the second Czech composer to achieve worldwide recognition. Following Smetana's nationalist example, Dvořák frequently employed aspects, specifically rhythms, of the folk music of Moravia and his native Bohemia. Dvořák's own style has been described as "the fullest recreation of a national idiom with that of the symphonic tradition, absorbing folk influences and finding effective ways of using them."
Document 5: Nikolay and Medea Figner: Nikolay Figner (1857–1918), lyric tenor, and Medea Figner (1859–1952), mezzo-soprano, later soprano, were a husband-and-wife team of opera singers active in Russia between 1889 and 1904. Medea was Italian-born (her original surname was Mei) but she became completely Russianized after marrying Nikolay. They had separate careers before their wedding, and again after their divorce in 1904, but during the 15 years of their marriage they almost always sang in the same performances. They created the main tenor and soprano roles in two operas by Pyotr Ilyich Tchaikovsky – "The Queen of Spades" and "Iolanta" – and appeared in a number of other important Russian musical premieres.
Document 6: Skočná: Skočná is a rapid Slavic folk-dance, normally in metre. Czech composers Antonín Dvořák and Bedřich Smetana used this dance, the latter in the third act of "The Bartered Bride" where it is danced by a circus troup and is often known as the Dance of the Comedians. Dvořák's 5th, 7th and 11th Slavonic Dances are in the form of the skočná.
Document 7: The Bartered Bride (1932 film): The Bartered Bride (German: "Die verkaufte Braut" ) is a 1932 German film directed by Max Ophüls and based on the comic opera of the same name by Czech composer Bedřich Smetana.
Document 8: Leoš Janáček: Leoš Janáček (] , baptised Leo Eugen Janáček; 3 July 1854 – 12 August 1928) was a Czech composer, musical theorist, folklorist, publicist and teacher. He was inspired by Moravian and other Slavic folk music to create an original, modern musical style.
Document 9: Berta Foersterová: Berta Foersterová (née Lautererová, sometimes styled Bertha Laurer or Berta Foersterová-Lautererová) (born Prague, January 11, 1869 - died there April 9, 1936) was a Czech operatic soprano active in Germany. The wife of composer Josef Bohuslav Foerster, she met him while appearing at the Hamburg State Opera. She created the role of Desdemona in the Czech premiere of Giuseppe Verdi's "Otello", and sang Tatiana in the Czech premiere of Pyotr Ilyich Tchaikovsky's "Eugene Onegin"; she also appeared in the world premiere of Antonín Dvořák's "The Jacobin".
Document 10: Eleanora Ehrenbergů: Eleanora Ehrenbergů (sometimes spelled Eleanora Ehrenbergová or Eleanora Ehrenberg) (1 November 1832 – 30 August 1912) was a Czech operatic soprano. In 1854 she made her professional opera debut at the Estates Theatre in the title role of Donizetti's "Lucia di Lammermoor". In 1866 she created the role of Mařenka in the world première of Bedřich Smetana's "The Bartered Bride", and in 1868 she portrayed Jitka in the premiere of Smetana's "Dalibor". She retired from the stage sometime in the 1880s.
Document 11: The Bartered Bride: The Bartered Bride (, "The Sold Bride") is a comic opera in three acts by the Czech composer Bedřich Smetana, to a libretto by Karel Sabina. The work is generally regarded as a major contribution towards the development of Czech music. It was composed during the period 1863–66, and first performed at the Provisional Theatre, Prague, on 30 May 1866 in a two-act format with spoken dialogue.
Document 12: Betty Fibichová: Betty Fibichová (16 March 1846 – 20 May 1901) was a Czechoslovak opera singer and the wife of composer Zdeněk Fibich. The greatest Czech operatic contralto of her day, she enjoyed close artistic partnerships with both Antonín Dvořák and Bedřich Smetana in addition to collaborating frequently with her husband.
Document 13: Jean Sibelius: Jean Sibelius ( ;    ), born Johan Julius Christian Sibelius (8 December 186520 September 1957), was a Finnish composer and violinist of the late Romantic and early-modern periods. He is widely recognized as his country's greatest composer and, through his music, is often credited with having helped Finland to develop a national identity during its struggle for independence from Russia.
Document 14: My Home (Dvořák): My Home (Czech: "Domov můj, předehra ke hře F. F. Šamberka" ), Op. 62, B. 125a, is an overture in C major by Czech composer Antonín Dvořák. The overture was composed from December 1881 to January 23, 1882 as one of nine numbers comprising the incidental music for the play "Josef Kajetán Tyl" by František Ferdinand Šamberk. Dvořák constructed the music in sonata form on two song themes associated with the play's protagonist, Czech dramatist Josef Kajetán Tyl: ""Kde domov můj?"" by František Škroup, and the folk tune ""Na tom našem dvoře"". Škroup composed ""Kde domov můj?"" ("Where is my home?") in 1834 to a text written by Tyl. The song quickly became popular and was later designated as the Czech national anthem. ""Na tom našem dvoře"" was a song sung in productions of "Strakonický dudák" (The Bagpiper of Strakonice), one of Tyl's most popular plays. The overture is largely performed separately as a concert work, usually lasting about ten minutes. Many conductors have conducted this piece including Jan Kučera, Bohumil Gregor and Karel Ančerl.
Document 15: Alfred (Dvořák): Alfred is a heroic opera in three acts by the Czech composer Antonín Dvořák. It was Dvořák's first opera and the only one he composed to a German text. The libretto, by Carl Theodor Körner, had already been set by Friedrich von Flotow (as "Alfred der Große") and is based on the story of the English king Alfred the Great. Composed in 1870, "Alfred" was never performed during Dvořák's lifetime. It received its premiere (in Czech translation) at the City Theatre, Olomouc on 10 December 1938.
ground_truth: Betty Fibichová