Frédéric Chopin, Nocturne 20,

The Chopin nocturnes constitute 21 short pieces for solo piano written by Frédéric Chopin between 1827 and 1846. They are generally considered among the finest short solo works for the instrument and hold an important place in contemporary concert repertoire. Although Chopin did not invent the nocturne, he popularized and expanded on it, building on the form developed by Irish composer John Field.
The nocturnes numbered 1 to 18 were published during his life, in twos or threes, in the order of composition. Numbers 19 and 21 were actually written first, prior to Chopin's departure from Poland, but published posthumously. Number 20 was not originally entitled "nocturne" at all,but since publication in 1870 as such, is generally included with publications and recordings of the set.

"The Chopin Nocturne"

Chopin's nocturnes carry many similarities with those of Field while at the same time retaining a distinct, unique sound of their own. One aspect of the nocturne that Chopin continued from Field is the use of a song-like melody in the right hand. This is one of the most if not the most important features to the nocturne as a whole. The use of the melody as vocals bestowed a greater emotional depth to the piece, drawing the listener in to a greater extent. Along with the right-hand melody, Chopin continued the use of another nocturne "necessity," that of playing broken chords on the left hand to act as the rhythm under his right-handed "vocal" melody. Another technique used by Field and continued by Chopin was the more extensive use of the pedal. By using the pedal more, the music gains more emotional expression through sustained notes, giving the piece an aura of drama. With these main attributes of the "Field nocturne" Chopin was inspired, and expanded upon them to develop the "Chopin nocturne."
One of the greatest innovations made by Chopin to the nocturne was his use of a more freely flowing rhythm, a technique based on the classical music style. Also, Chopin further developed the structure of the nocturne, taking inspiration from the Italian and French opera arias, as well as the sonata form. Composer Franz Liszt even insisted that Chopin's nocturnes were influenced by Vincenzo Bellini's "bel canto" arias, a statement affirmed and echoed by many in the music world. A further innovation of Chopin's was his use of counterpoint to create tension in the nocturnes, a method that even further expanded the dramatic tone and feel of the piece itself. It was mainly through these themes of operatic influence, freer rhythms, and an expansion into more complex structures and melodic playing that Chopin made his mark on the nocturne Many think of the "Chopin nocturne" as a mix between the form and structure of Field and the sound of Mozart, displaying a classic/romantic-influenced theme within the music.

Form

While meters and keys vary, the nocturnes are generally set in ternary form (A-B-A), featuring a melancholy mood, and a clear melody floating over a left-hand accompaniment of arpeggios or broken chords. Repetitions of the main theme generally add increasingly ornate embellishments, notably in Opus 9 No. 2 in E♭. From the 7th and 8th nocturnes onwards, Chopin published them in contrasting pairs, although each can stand alone as a complete work. Exceptions to the ternary form pattern include Opus 9 No. 2 and Op. 55 No. 2 in E♭, neither of which contain a contrasting section, Op. 15 No. 3 in binary form with a novel coda, and Op. 37 No. 2 in ABABA form.
The tempo marking of all but one of the nocturnes is a variation of Lento, Larghetto or Andante, the Allegretto of No. 3 breaking the mould.

Influence

When first published, Chopin's nocturnes were met with mixed reactions from critics, though many of them were not in his favor. However, through the process of time, many who had initially been displeased with the nocturnes found themselves retracting previous criticisms, holding the short compositions in high respect.
While the popularity of individual nocturnes has varied considerably since Chopin's death, they have retained a significant position in the piano repertoire, with the Op. 9 No. 2 in E♭ major and the Op. 27 No. 2 in D♭ major perhaps the most enduringly popular.
Various composers from both Chopin's lifetime and later have expressed their influence from his work with nocturnes. Such artists as Johannes Brahms and Richard Wagner display similar melodic technique and style in their music as Chopin. Other composers such as Mendelssohn, Schumann, and Liszt described the genius that lay within Chopin's nocturnes It is clear that these short piano compositions made a noticeable and lasting impact on music and composition during the romantic period.
Chopin extracted much of his influence from poetry and paintings, often using his surroundings to inspire his melodies and phrasing. His Nocturne compositions are a clear example of the beauty of nature and display his impressionism.