A work from around 1899, when the composer was about 14 years old. Along with Barcarolle Op. 4, Song Without Words Op. 5, Butterfly Op. 6, Minuet Op. 7, and Song Without Words Op. 10, it was published as Six Piano Pieces (Sechs Klavierstücke) in 1902 by the Budapest publisher Harmonia. In these early works, the influence of Romantic composers such as Mendelssohn's Songs Without Words, Grieg's Lyric Pieces, and short pieces by Tchaikovsky and Schumann is clearly discernible. All of these works showcase Dora's clear, youthful, and fresh sensibility within a very simple and naive style.

This Impromptu Op. 9 (a) was later arranged by Dora herself into a piano quartet in 1903 (as Piano Quartet Op. 9 (b)).