The '''Prelude Op. 28, No. 20,''' in C minor by Frédéric Chopin has been dubbed the "Funeral March" by Hans von Bülow but is commonly known as the "Chord Prelude" due to its slow progression of quarter note chords.[http://www.chopinmusic.net/works/preludes/ ChopinMusic.net]
The prelude was originally written in two sections of four measures, ending at measure nine. Chopin later added a repeat of the last four measures at a softer level, with an expressive swell before the final cadence.