Full set Piano Etude Op. 25, No. 9 in G-flat major sheet music.
Piano Etude Op. 25, No. 9 in G-flat major - "Butterfly" etude is a study of staccato - macchiato alternations, marked throughout the piece. It is the shortest of the twenty-four, and lasts under a minute played at proper tempo.
The melody is created by playing a detached octave, then two non-detached octaves. This makes a four-note group, the structure of which is used during the whole piece to convey the melody. This structure of rapid octaves can pose a challenge to the less technically experienced.
Another difficulty is in the constant switching of solid octaves to detached octaves. It is much more straightforward to simply play one or the other for the whole piece.