Frédéric Chopin's Fantaisie-Impromptu in C-sharp minor is a solo piano composition. It is one of his best-known pieces. It was composed in 1834. The structure of the piece goes something along the lines of A B A Coda. Some aspects of this piece are similar to Beethoven's "Moonlight" Sonata. The opening tempo is allegro agitato. It changes to largo for the two bars after the 'A' section. The tempo for most of the 'B' section is moderato cantabile. Finally, after the 'B' section, it changes to presto. The piece on a C-sharp major rolled chord.