January 1826. Later in the year came the String Quartet No. 15 in G major, (D 887, first published as op. 161), the Rondo in B minor for violin and piano (D. 895), Rondeau brillant, and the Piano Sonata in G major, (D 894, first published as Fantasie in G, op. 78). He also produced in 1826 three Shakespearian songs, of which "" (D. 889) and "" (D. 891) were allegedly written on the same day, the former at a tavern where he broke his afternoon's walk, the latter on his return to his lodging in the evening. The works of his last two years reveal a composer entering a new professional and compositional stage. Although parts of Schubert's personality were influenced by his friends, he nurtured an intensely personal dimension in solitude; it was out of this dimension that he wrote his greatest music. The death of Beethoven affected Schubert deeply, and may have motivated Schubert to reach new artistic peaks. In 1827, Schubert wrote the song cycle Winterreise (D. 911), the Fantasy in C major for violin and piano (D. 934, first published as op. post. 159), the Impromptus for piano, and the two piano trios (the first in B-flat major (D. 898), and the second in E-flat major, (D. 929); in 1828 the cantata Mirjams Siegesgesang (Victory Song of Miriam, D 942) on a text by Franz Grillparzer, the Mass in E-flat major (D. 950), the Tantum Ergo (D. 962) in the same key, the String Quintet in C major (D. 956), the second "Benedictus" to the Mass in C major (D. 961), the three final piano sonatas (D. 958, D. 959, and D. 960), and the collection 13 Lieder nach Gedichten von Rellstab und Heine for voice and piano, also known as Schwanengesang (Swan-song, D. 957). (This collection – which includes settings of words by Heinrich Heine, Ludwig Rellstab, and Johann Gabriel Seidl – is not a true song cycle like Die schöne Müllerin or Winterreise.) The Great C major symphony is dated 1828, but Schubert scholars believe that this symphony was largely written in 1825–1826 (being referred to while he was on holiday at Gastein in 1825—that work, once considered lost, is now generally seen as an early stage of his C major symphony) and was revised for prospective performance in 1828. The orchestra of the Gesellschaft reportedly read through the symphony at a rehearsal,