An unstable impression is imparted to the musical idea of the main section by the C♭ persistently played on the strong beat of every measure. This instability persists until the perfect cadence in measure 32, playing a crucial role within the piece. It is also significant that the piece concludes unresolved precisely due to this C♭. Although the opening melody is also used as a motive in the secondary section, the musical atmosphere changes significantly due to the active accompaniment, voice exchanges, and sequences. The trio in B major also forms a ternary structure, with each of its musical ideas creating a vivid contrast to the tonally, thematically, and texturally unstable opening section of the piece.