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Frédéric Chopin wrote his Trois nouvelles études ("three new studies") for piano in 1839, as a contribution to "Méthode des méthodes de piano", a piano instruction book by Ignaz Moscheles and François-Joseph Fétis.[1] They are often erroneously described as posthumous. These études are less technical than the composer's Op. 10 and 25 and retain Chopin's original formula for harmonic and structural balance.