Etude Op.10, No.4 in C-sharp minor is a solo piano work composed by Fryderyk (Frederic) Chopin in 1830. This study is written with a very quick tempo, continual sixteenth notes, and rapid voice fluctuations. Although the etude is technically more difficult to execute than most of the other Chopin etudes, the focus is on developing the ability to distinguish between the melody, which is constantly passed from hand to hand.
The etude is episodic in length and complexity, and features four distinct sections. The first theme is presented, and rapidly progresses into a short second theme. This leads back into a repetition of the first theme, which then develops into the climax and Coda.