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Frédéric Chopin’s Impromptu No. 3 in G-flat major, Op. 51, for piano, was published in February 1843. It was the last in order of composition of his four impromptus, but the third published.
The piece is written in 12/8 time.

Frédéric Chopin’s Impromptu No. 2 in F sharp major, Op. 36 was composed in 1839 and published in the following year. The dolcissimo melody occurs throughout the piece and there is an indefinite tonality. The Impromptu begins with a nocturne-esque chord. The piece is in the less commonly used key of F-sharp major, which is used in very few major compositions in the Romantic era, such as Ludwig van Beethoven’s A Thérèse sonata and Chopin’s famous Barcarolle.

Frédéric Chopin’s Impromptu No. 1 in A flat major, Op. 29 was composed in 1837. It contains highly sophisticated musical style and is regarded as difficult for many pianists to perform.

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 the third movement of Beethoven’s Moonlight Sonata. Two measures after the melody begins, an abrupt run and down has the exact same notes as the cadenza in the presto agitato of the moonlight sonata, movement 3. Also the tempo marking is identical to the famous third movement.Despite Chopin’s request that the piece not be published, Fontana did so anyway.