Schubert’s preference for moving keys by thirds (E-flat to G-flat or B/C-flat) rather than the traditional circle of fifths.
Franz Schubert’s is a masterclass in perpetual motion and harmonic fluidness. Published in 1827, just a year before his death, it exemplifies Schubert’s unique ability to blend Classical structures with the burgeoning expressive freedom of the Romantic era.
The "A" section is built on a non-stop stream of triplets. Harmonically, it is less about complex chords and more about .
This section utilizes heavy accents and syncopation. The harmony moves through a series of Secondary Dominants , pushing the tension until it reaches a climax that eventually winds back down to the E-flat major scales of the "A" section. The Coda: The Final Transformation
The triplet scales return, but they are now shadowed by the flattened 3rd (G-flat), 6th (C-flat), and 7th (D-flat).
On paper, E-flat major and B minor are distantly related. However, Schubert treats them as enharmonic neighbors. He uses G-flat (the 3rd of E-flat minor) as a pivot to F-sharp , which becomes the dominant (V) of B minor.