Frédéric Chopin's Fantaisie-Impromptu in C-sharp minor, Op. posth. 66, is a solo piano composition. It was composed in 1834 and dedicated to Julian Fontana, who published the piece despite Chopin's request not to do so. Despite negative comments, the Fantaisie-Impromptu is one of Chopin's most frequently performed and popular compositions.
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