Mozart's creation was completed in unimaginable difficulties. At that time, the composer's wife was ill and had no money to buy medicine, and the hungry children had no bread. It was in this situation of embarrassment, grief and anger that the talented composer wrote the "Symphony No. 40 in G minor" which took two weeks and was completed on July 25, 1788. The symphony does not begin with a slow introduction. At the same time, Mozart set the tune to G minor, which he rarely used, symbolizing sadness and pain. This is the most somber, but also the most bold and violent work that Mozart ever wrote. All movements of this symphony are lyrical. Its keynote is a lyrical style coupled with a pathos atmosphere, and at the same time it is full of an angry and passionate spirit. This work expresses the composer's sadness. But this is not a direct reflection of the composer's poor life at that time, but it deeply embodies the life experience of a poor composer. It is the epitome of all the tragic experiences and setbacks in his life. It was Mozart’s tearful smile. Although the classical era has left us. However, from this work, we can clearly feel Mozart's breathing and the loneliness of his soul when he "thought of the heaven and earth for a long time, crying alone with sadness".

The first movement of Mozart's "Symphony No. 40 in G minor" is an extremely fast Allegro. This is a typical sonata-style movement. Over the swaying accompaniment of the viola, an agitated and anxious theme emerges from the violin part. She tapped gently with a sad and depressing tone and an uneasy rhythm. After the orchestra's cadence chords, this melancholic and charming first theme reappears. When the music gradually turns to a stretched and smooth tone, a second theme immersed in the melancholy color of a minor seems to pour out the composer's deeper sadness. After this, the music was completely in an inextricable state of painful thoughts. As the main theme of the first movement of the symphony, she sets the sad tone of the music. In the transition to the sub-part theme, the first and second themes appear alternately, and the huge fluctuations of strong and weak sounds show a momentum of rushing out of pain, but it is quickly interrupted by a bar of rest. After entering the development part, the key changes to F sharp minor. Frequent transpositions create a strong counterpoint effect, highlighting the drama of the music and echoing the beginning. As the violin sighs slightly, the oboe joins in to play a quiet melody. His finely crafted notes reflect Mozart’s optimistic and cheerful nature. The secondary theme is built on smooth chromatic tones. But the bright atmosphere of the secondary theme did not last long. The woodwind instruments played a descending tone, and the color of the movement suddenly changed with a dissonant sound. After entering the recapitulation, we traditionally returned to the first theme, but it did not calm down. The six key changes made the music more and more tense. The painful and urgent atmosphere hit everywhere, and there was never a moment of stability and tranquility. The first movement ends in a painful atmosphere.

The second movement is the Andante in sonata form. In this movement, the rapidity of the first movement turns to gentleness, and the key changes from G minor to E flat major. A brighter tone emerges here after the sentimental first movement. But this was merely a respite. This movement consists of two relatively small themes. They are calm, clear, lyrical, and complement each other, reflecting a gentle and cordial light. Just like Mozart's family that is both poor and warm. But in this movement there is an uneasy pulsating undertone from beginning to end. It's like looking for answers but finding none. The staccato rhythms and individual tones in the two themes also cast a shadow over the serene music.

The third movement is Allegro and Minuet. Minuet was originally a court dance popular among the upper class. But the composer, who shoulders the burden of life, shows a heavy pace. The minuet written in complex three-section form is passionate and passionate, but it does not have the gentle and elegant characteristics of the minuet at all. In the dance music, you can feel the unique chromatic tones of the secondary theme in the first movement and the interweaving of some motives. At the beginning of the movement, the orchestra played a vigorous and powerful tone. It continues to surge upward in the depressing key of G minor, and only when it reaches the highest point in the treble range does the music burst out with painful and sad tears. In the contrasting middle section, G minor switches to G major. A string of bright lights suddenly brightens people's mood.

The three middle tones in the middle are the only place in the entire music that can make people feel comfortable and happy, which symbolizes Mozart's happy nature. But because she was sandwiched in the middle of a painfully struggling minuet, even though the violins and woodwind instruments sang the gentle melody, the music was permeated with a touch of sadness. Closing our eyes, we can seem to see Mozart's big blue eyes full of tears, but with a strong and innocent smile. It was not until the exciting and powerful dance theme reappeared that we seemed to see the composer gain a moment of comfort in the slightly calmer middle section. The recurring theme seems to add greater momentum, propelling the music towards the finale.

The fourth movement is Allegro. This movement is also in sonata form. It continues to develop the dramatic effect of the first movement. At the beginning of this finale movement, the anxious first theme rushes straight in with a tone similar to a minuet, with a great contrast in intensity. This theme contains elements of stark contrast. The first half has a soft tone, played by string instruments; the second half has a majestic tone, with the ensemble joining in and increasing the intensity. Here, like the first movement, there is a rapid and tragic climax. And this quality emerges even more towards the end. Soon the theme disappeared into the endless torrent of string music. This turbulent sound wave seems to be Mozart taking rapid and determined steps to face the various hardships in life. The music is filled with the composer's unyielding courage. Although the second theme is singing, there is a sharp chord that collides with each other in the middle of the music. It gives people a very unstable feeling. The performance at the end of the movement was brilliant and exhilarating. It seems to be telling people that no matter how difficult the road in life is, move forward bravely! One day there will be joy and happiness.