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. They are often erroneously described as posthumous. In general, these études display little of the technical brilliance of most of the composer's Op. 10 and 25, though they do retain Chopin's original formula for harmonic and structural balance. The melody of the second étude in A-flat major sits atop a series of chords in the right hand with a simple bass in the left hand. It was also the last piece Franz Liszt was heard playing before he died. It develops students' facility with 2-on-3 polyrhythms.