The main key is F minor. The overall structure consists of a theme and variations, with both the theme and each variation being in binary form.

Theme:

A[a(measures 1-4) + a1(measures 5-8)]

B[b(measures 9-12) + c(measures 13-16)]

The theme begins with an imperfect cadence on the dominant chord. After eight measures of a sorrowful melody, section B, starting from measure 9, modulates partially to the parallel key of E-flat major, gaining a fleeting brightness. However, from measure 13, it returns to the main key, concluding sadly.

Variation:

A1[a2(measures 17-20) + a3(measures 21-24)]

B1[b1(measures 25-28) + c1(measures 29-32)]

From measure 17, the variation begins, and the movement changes to a more active progression with 16th notes.