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.[3] 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,[8] 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.[3] 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. (Wikipedia)