Nocturne in C minor, Op. posth. (Chopin)

The Nocturne No. 21 in C minor, Op. posth. is a musical work for solo piano written by Frédéric Chopin in 1837. It was the last of Chopin's nocturnes to be published, and was done so posthumously. It is famous for its striking simplicity and folk-like melody. Among the 21 nocturnes known to have been written by Chopin, this is one of the two that end in minor - another being the Nocturne No. 13 in C minor, Op. 48 No. 1.