Grande Étude de perfectionnement

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Étude de perfectionnement de la Méthode des méthodes are two pieces by the

S.142, followed by a revision, Ab Irato, S.143, both composed in E minor
. They are regarded as eccentric pieces with beautiful interludes of arpeggiated figures, though both are rarely performed.

The first edition was composed as a contribution for the book "Méthode des méthodes de piano" by Ignaz Moscheles and François-Joseph Fétis. Frédéric Chopin's Trois nouvelles études are also a part of the set.