Chopin – Prelude in C sharp minor, Op. 45
Frédéric Chopin wrote a number of preludes for piano solo. His cycle of 24 Preludes, Op. 28, covers all major and minor keys. In addition, Chopin wrote three other preludes: a prelude in C♯ minor, Op. 45; a piece in A♭ major from 1834; and an unfinished piece in E♭ minor. These are sometimes referred to as Nos. 25, 26, and 27, respectively.
The Prelude in C♯ minor, Op. 45 (sometimes listed as Prelude No. 25), was composed in 1841. It was dedicated to Princess E. Czernicheff (Elisaweta Tschernyschewa), and contains widely extending basses and highly expressive and effective chromatic modulations over a rather uniform thematic basis.