Notated in G-flat, Variation 15 returns to the home key of F-sharp minor.
Like the preceding Variation 14, there is a beautiful melody in the right hand with an accompaniment of arpeggios in the left hand that continue throughout. This time the arpeggios only rise, without the rise-and-fall of Variation 14.
In yet another canon the right-hand melody is followed in the left-hand at a distance of one bar and an interval of a sixth ("canon in sixths").
Variation 15 seems to make reference to an Impromptu by Schubert (Op. 90, No. 2), a composer much beloved by Robert Schumann, and it may allude to the opening section of Schumann’s Humoreske.
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