Fantaisie-Impromptu From Wikipedia, the free encyclopedia
Frédéric Chopin's Fantaisie-Impromptu in C-sharp minor, Opus posthumous 66, is a solo piano composition and one of his most well-known pieces. It was composed in 1834 and dedicated to Julian Fontana. Some aspects of this piece are similar to Beethoven's Moonlight Sonata[citation needed]. Despite Chopin's request that the piece not be published, Fontana did so anyway.
The piece uses many cross-rhythms (the right hand plays semiquavers against the left hand playing triplets) and a ceaselessly moving note figuration and is in cut time. The opening tempo is marked allegro agitato. The tempo changes to largo and later moderato cantabile when the key changes to D-flat major, the enharmonic equivalent of the more obscure tonic major key of C-sharp major. The piece then changes back to the original tempo where it continues in C-sharp minor as before. It ends off in an ambiguous fantasy-like ending, in a quiet and mysterious way, where the left hand repeats the first few notes of the moderato section theme, while the right hand continues playing sixteenth notes (semiquavers).