Question: What was Bill Dvorak's fifth cousin's nationality?

full_context: Document 1: Bill Dvorak: Bill Dvorak is a Salida, Colorado-based whitewater rafting outfitter. He is best known for organizing multi-day rafting trips on the Dolores and Green Rivers where professional classical musicians give nightly concerts. He claims to be a fifth cousin of classical composer Antonín Dvořák.
Document 2: 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 3: String Quartet No. 10 (Dvořák): Antonín Dvořák wrote his String Quartet No. 10 in E flat major Op. 51 (B. 92) in 1879 at the request of the leader of the Florentine Quartet. It is sometimes nicknamed the Slavonic quartet.
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: String Quartet No. 14 (Dvořák): The String Quartet No. 14 in A-flat major, op. 105, B. 193, was the last string quartet completed by Antonín Dvořák, even though it was published before his Thirteenth Quartet (which appeared with the higher opus number 106). Dvořák finished his Fourteenth Quartet in 1895, when he had returned to Bohemia after his visit to America. The gestation of the Quartet had actually begun in America and lasted six months, which was rather protracted for the composer. This Quartet marked an important point in Dvořák's development because he would devote himself almost exclusively to writing explicit program music, namely symphonic poems and operas, afterwards.
Document 6: 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 7: 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 8: 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.
Document 9: 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 10: Antonín Dvořák Museum: The Antonín Dvořák Museum in Prague is a museum dedicated to the great Czech composer Antonín Dvořák (1841-1904).
Document 11: Humoresques (Dvořák): Humoresques (Czech: Humoresky ), Op. 101 (B. 187), is a piano cycle by the Czech composer Antonín Dvořák, written during the summer of 1894. One writer says "the seventh Humoresque is probably the most famous small piano work ever written after Beethoven's "Für Elise.""
Document 12: 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 13: Moravian Duets: Moravian Duets (in Czech: "Moravské dvojzpěvy" ) by Antonín Dvořák is a cycle of 23 Moravian folk poetry settings for two voices with piano accompaniment, composed between 1875 and 1881. The Duets, published in three volumes, Op. 20 (B. 50), Op. 32 (B. 60 and 62), and Op. 38 (B. 69), occupy an important position among Dvořák's other works. The fifteen duets of Op. 32 are the most famous part of the cycle. Popular interest in the "Moravian Duets" was the starting point for subsequent works which propelled Dvořák to international fame.
Document 14: Violin Sonatina (Dvořák): The Sonatina in G major for violin and piano (), Op. 100, B. 183, was written by Antonín Dvořák between November 19 and December 3, 1893, in New York City. It was the last chamber composition he wrote during his sojourn in America. Dvořák catered the sonatina to the gradually developing musical abilities of his children, especially those of his 15-year-old daughter Ottilie and 10-year-old son Toník. In a letter to Fritz Simrock on January 2, 1894, Dvořák conceived the piece in the following terms: ""It is intended for youths (dedicated to my two children), but even grown-ups, adults, should be able to converse with it...""
Document 15: Bill Caswell: Bill Caswell is a country music singer-songwriter and musician active since the early 1980s. Together with his wife Rosi Caswell, the duo from Bartlesville, Oklahoma perform on rare old style instruments including the ukelin, mandolin-guitar, bell-harp, and tremeloa. In the 1980s he performed his music on television in "Hee Haw" and on live radio in "A Prairie Home Companion". The two together performed at Dollywood in Gatlinburg, Tennessee for five seasons.
ground_truth: Czech