25 Études caractéristiques, Op.300. Number 9

Jean-Baptiste Duvernoy (c. 1802 – c. 1880) was a French pianist and composer of the Romantic period.
He is best known for his Elementary Studies, Op. 176, designed to improve finger co-ordination.
He is also known for The School of Mechanism, Op. 120.
Duvernoy also wrote many other studies designed to help finger co-ordination.
He was professor of piano at the Conservatoire de Paris and author of more than 300 works. Not much is known about his life.

List of composition on IMSLP.
Agnes Polka
Au clair de la lune, Op.296
3 Bluettes, Op.272
Le bourdon de Notre-Dame, Op.244
Le carnaval de Venise, Op.316
Dans la montagne, Op.239
École du mécanisme, Op.120
Ecole du style, Op.168
École primaire, Op.176
L'émulation, Op.314
25 Études caractéristiques, Op.300 S
12 Études mélodiques de rhythme, Op.255
25 Études progressives, Op.298
Fantaisie sur 'La Dame de Pique', Op.195
Fantaisie sur la Romanesca, Op.101
La Fiorentina, Op.144
Manuel théorique et pratique des gammes, Op.304
Les mignonnettes, Op.295
Preparatory School of Velocity, Op.276
Schule des Anschlags, Op.263
Le soir, Op.311
Un jour d'été, Op.252