Étude Op. 25, No. in A-flat major is a solo piano work composed by Frédéric Chopin in 1836, and published in 1837. Its romanticized names are "Aeolian Harp," for Schumann's description of it, and "The Shepherd Boy," for Chopin's advice to a pupil to picture a shepherd boy refuging in a grotto to avoid a storm playing the melody on his flute. This work consists entirely of rapid arpeggios and harmonic modulations based on A-flat major. Robert Schumann famously praised this work in a dissertation on the Études. Stating that the arpeggios were "fantastic", and the melody "wondrous", Schumann coined the alternate name "Aeolian Harp" for this étude.