ショパンピアノエチュードcシャープマイナーop。 10いいえ.

Étude Op. 10, No. 4, in C-sharp minor, is a study for solo piano composed by Frédéric Chopin in 1830. It was first published in 1833 as the fourth piece of his Études Op. 10. This passionate study, a very fast Presto con fuoco, features continuous sixteenth notes (semiquavers), in perpetuum mobile fashion involving both hands.