Chopin Prelude Op. 28 No 20 in C minor
From Wiki
“Often called the “Chord” prelude. Brief, with large slow quarter-note chords in the right hand predominating,
against quarter-note octaves in the left. It was originally
written in two sections of four measures, although Chopin later
added a repeat of the last four measures at a softer level, with
an expressive swell before the final cadence.”
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