Nocturne was first composed by British composer Field (1782-1837). He used beautiful melodies with calm chords to express his quiet and dreamy mood at night. Chopin inherited this form and made great development and innovation on it. Chopin's nocturnes contain quite a variety of artistic conception, even passionate dramatic images. Surprisingly, no matter how complicated and exciting music is, it still loses the overall feeling of "night". Because Chopin gave the nocturne a new look, later generations regarded it as one of the unique symbols of Chopin's creation. Chopin's 2 1 serenade is so charming in almost every capital. Perhaps the audience is most familiar with "The Second Serenade in bE Major", whose main theme has long been deeply rooted in people's hearts: the middle section begins with a hymn-like chord, which is calm and dignified and contains inner strength. At first, this force was the exposure of debris, which gradually accumulated and exposed more and more debris. Finally, an avalanche broke out from top to bottom. At this time, I am really in the "night" and my heart is in the "day". After the outbreak of the middle section, the "night" can no longer be calm. When the first paragraph reappears, the same tune is accompanied by a completely different texture. The original rigorous rhythm has now become a triplet, and the music has become sad and sad, and it can't be calmed down for a long time. After adding an extended termination, I barely quieted down and finally disappeared into the extended voice, but the heavy heart I left never disappeared.