'''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.Palmer, W: Chopin Etudes for the Piano, page 126. Alfred Publishing Co., Inc., 1992 This work is a series of rising and falling arpeggios in various chord progressions from C minor. In addition, its opening bars recall the chord structure of the opening bars of the second prelude of the first book of ''The Well-Tempered Clavier'' by Johann Sebastian Bach.