Question: What nationality was the composer of the song cycle Die schöne Müllerin ?

full_context: Document 1: Lied: The lied ( or , plural lieder ; ] , plural ] , German for "song") is a setting of a German poem to classical music. The term is used for songs from the late fourteenth or early fifteenth centuries or even to refer to Minnesang from as early as the 12th and 13th centuries. It later came especially to refer to settings of Romantic poetry during the late eighteenth and nineteenth centuries, and into the early twentieth century. Examples include settings by Ludwig van Beethoven, Franz Schubert, Robert Schumann, Johannes Brahms, Hugo Wolf or Richard Strauss. Among English speakers, however, "lied" is often used interchangeably with "art song" to encompass works that the tradition has inspired in other languages. The poems that have been made into lieder often center on pastoral themes or themes of romantic love.
Document 2: Franz Schubert's Works: Franz Schubert's Works: Complete and Authoritative Edition (German: "Franz Schubert's Werke: Kritisch durchgesehene Gesammtausgabe" ), also known as the Collected Edition, is a late 19th-century publication of Franz Schubert's compositions. The publication is also known as the Alte Gesamt-Ausgabe ("the former complete edition"), abbreviated as AGA, for instance in the 1978 edition of the Deutsch catalogue, in order to distinguish it from the New Schubert Edition.
Document 3: Franz Schreker: Franz Schreker (originally "Schrecker"; 23 March 1878, Monaco – 21 March 1934, Berlin) was an Austrian composer, conductor, teacher and administrator. Primarily a composer of operas, Schreker developed a style characterized by aesthetic plurality (a mixture of Romanticism, Naturalism, Symbolism, Impressionism, Expressionism and Neue Sachlichkeit), timbral experimentation, strategies of extended tonality and conception of total music theatre into the narrative of 20th-century music.
Document 4: Joseph Haydn: (Franz) Joseph Haydn ( ; ] ; 31 March 173231 May 1809) was an Austrian composer of the Classical period. He was instrumental in the development of chamber music such as the piano trio and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet".
Document 5: Dichterliebe: Dichterliebe, "A Poet's Love" (composed 1840), is the best-known song cycle of Robert Schumann (Op. 48). The texts for the 16 songs come from the "Lyrisches Intermezzo" of Heinrich Heine, written 1822–23 and published as part of the poet's "Das Buch der Lieder". Following the song-cycles of Franz Schubert ("Die schöne Müllerin" and "Winterreise"), those of Schumann constitute part of the central core of the genre in musical literature.
Document 6: Schubert's song cycles: Franz Schubert's best known song cycles, like "Die schöne Müllerin" and "Winterreise" are based on separate poems with a common theme and narrative. Other song cycles are based on consecutive excerpts of the same literary work: Schubert's "Ave Maria" is part of such a song cycle based on excerpts of the same poem, in this case by Walter Scott.
Document 7: Franz Schubert: Franz Peter Schubert (] ; 31 January 179719 November 1828) was an Austrian composer.
Document 8: Wilhelm Müller: Johann Ludwig Wilhelm Müller (7 October 1794 – 30 September 1827) was a German lyric poet, most well known as the author of Die schöne Müllerin and Winterreise, the famous Franz Schubert song cycles.
Document 9: List of compositions by Franz Schubert by genre: Franz Schubert (31 January 1797 – 19 November 1828) was an extremely prolific Austrian composer. He composed some 1500 works (or, when collections, cycles and variants are grouped, some thousand compositions). The largest group are the lieder for piano and solo voice (over six hundred), and nearly as many piano pieces. Schubert also composed some 150 part songs, some 40 liturgical compositions (including several masses) and around 20 stage works like operas and incidental music. His orchestral output includes a dozen symphonies (seven completed) and several overtures. Schubert's chamber music includes over 20 string quartets, and several quintets, trios and duos.
Document 10: Franz von Suppé: Franz von Suppé or Francesco Suppé Demelli (18 April 181921 May 1895) was an Austrian composer of light operas and other theatre music. He came from the Kingdom of Dalmatia, Austro-Hungarian Empire (now part of Croatia). A composer and conductor of the Romantic period, he is notable for his four dozen operettas.
Document 11: Winterreise: Winterreise ("Winter Journey") is a song cycle for voice and piano by Franz Schubert (D. 911, published as Op. 89 in 1828), a setting of 24 poems by Wilhelm Müller. It is the second of Schubert's two great song cycles on Müller's poems, the earlier being "Die schöne Müllerin" (D. 795, Op. 25, 1823). Both were originally written for tenor voice but are frequently transposed to suit other vocal ranges – the precedent being established by Schubert himself. These two works have posed interpretative demands on listeners and performers due to their scale and structural coherence. Although Ludwig van Beethoven's cycle "An die ferne Geliebte" ("To the Distant Beloved") had been published earlier, in 1816, Schubert's two cycles hold the foremost place in the history of the genre.
Document 12: Wanderer's Nightsong: "Wanderer's Nightsong" (German: "Wandrers Nachtlied" ) is the title of two poems by the German poet Johann Wolfgang von Goethe. Written in 1776 ("Der du von dem Himmel bist ") and in 1780 ("Über allen Gipfeln "), they are among Goethe's most famous works. Both were first edited together in his 1815 "Works" Vol. I with the headings "Wandrers Nachtlied " and "Ein gleiches " ("Another one"). Both works were set to music as lieder by Franz Schubert as D 224 and D 768.
Document 13: Franz Xaver Gruber: Franz Xaver Gruber (25 November 1787 – 7 June 1863), was an Austrian primary school teacher, church organist and composer in the village of Arnsdorf, who is best known for composing the music to "Stille Nacht" ("Silent Night").
Document 14: Die schöne Müllerin: Die schöne Müllerin (Op. 25, D. 795), is a song cycle by Franz Schubert based on poems by Wilhelm Müller. It is the earliest extended song cycle to be widely performed. The work is considered one of Schubert's most important cycles, and one of the pinnacles of "Lied", and it is widely performed and recorded.
Document 15: The Beautiful Miller: The Beautiful Miller (German: Die schöne Müllerin) is a 1954 West German romantic drama film directed by  Wolfgang Liebeneiner and starring  Waltraut Haas, Gerhard Riedmann and Hertha Feiler .
ground_truth: Austrian