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The Nocturnes, Op. 27 are two of the most famous solo piano pieces by Frédéric Chopin and often claimed to be among the best of all of his compositions. The piece was composed in 1836 and published in 1837. Both were dedicated to Countess d'Appony.

Nocturne in C-sharp Minor, Op. 27, No. 1
The Nocturne in C-sharp Minor is initially marked larghetto and is in 4/4 meter. It transitions to più mosso in measure 29. It is written in ternary form, with coda; the primary theme is introduced, followed by a secondary theme, and then a repetition of the first.

The opening alternates between major and minor and uses arpeggios, commonly found in other nocturnes as well, in the left-hand. It sounds "morbid and intentionally grating" and the effect is superior to that of any other nocturne.

Nocturne in D-flat Major, Op. 27, No. 2
The Nocturne in D-flat Major is written in binary form.