Étude Op. 25, No. 12 in C minor is the last of Frédéric Chopin’s formal studies for the Piano, opus 25, dedicated À Madame la Comtesse d’Agoult. It was first published in 1837 in French, German, and English. In the first French edition, the time signature is 4/4, but most recent editions of this piece follow the manuscript and German editions, which indicate cut time.