Although Schubert was clearly influenced by the Classical sonata forms...
wikipedia - 26 Sep 2020Although Schubert was clearly influenced by the Classical sonata forms of Beethoven and Mozart, his formal structures and his developments tend to give the impression more of melodic development than of harmonic drama.[100] This combination of Classical form and long-breathed Romantic melody sometimes lends them a discursive style: his Great C major Symphony was described by Robert Schumann as running to "heavenly lengths".[101]