Frederic Chopin Fantaisie Impromptu in C sharp minor, Op 66

Frédéric Chopin Fantaisie Impromptu in C♯ minor Op. posth. 66 was composed in 1834 as were the Four Mazurkas (Op. 17) and the Grande valse brillante in E♭ major (Op. 18), and published posthumously in 1855 even though Chopin had instructed that none of his unpublished manuscripts be published. The Fantaisie-Impromptu is one of Chopin's most frequently performed and popular compositions. Chronologically the first of Chopin’s impromptus, the Fantasy-Impromptu was not intended by the composer for publication. The assumption arose that it was withheld on account of a stated similarity – unintentional, no doubt – to the Impromptu in E flat major by Ignaz Moscheles. However, Arthur Rubinstein, who came into the possession of one of its manuscripts, assumes that this work was sold to a grande dame (the Baroness d’Est), who simply wanted to have it as her exclusive property. One way or another, the C sharp minor Impromptu remained in the composer’s portfolio and, along with the other ined