The theme song "Man is _" of the film "Wandering Earth 2" is directly touching and touching; The soundtrack of the film "The Deep Sea" conveys sincere feelings, which impressed the audience deeply. Both music and film are art close to the public, and the perfect combination of the two often makes classics. Film music obeys and serves the plot, but it has its own independence. With the passage of time, some plots of classic films may be forgotten, but as long as the melody of the music rings, the audience's memory can be awakened instantly, which is the unique charm of film music. The Shenzhen Symphony Orchestra performs the theme song "My Motherland" of the film "Shanggan Ridge". 1. Resonance with the emotions of the times to form collective memory music is an emotional art that appeals to the soul and creates imagination space, which is easy to trigger empathy and resonance. Speaking of classic movie songs, people will immediately think of the first batch of popular songs after the founding of the People's Republic of China, such as the theme song "My Motherland" of the film "Shangganling". The interlude "Sing a folk song to the Party" of the film "Lei Feng" and the interlude "Hero Praise" of the film "Hero Children". These songs are well known to the public because of the film, and have experienced the baptism of time in the wide spread of singing, and have blossomed the unique light of music art. The reason why these music works have become classics is that, in addition to the wonderful melody, style and lyrics, they have insight into the changes of the times at the time of their birth, and accurately tap the collective feelings of the Chinese people, that is, the intense and fervent love for the new China. In the 1950s, the founding of the People's Republic of China and the establishment of the basic socialist system made the people feel the joy and pride of being the master of the country. People who have just said goodbye to suffering are particularly impressed by the hard-won experience of new China and new life. Therefore, looking back on the war years, praising the revolutionary heroes, expressing the passion for construction, looking forward to the bright future, and thanksgiving and eulogizing the CPC are common feelings of that generation of Chinese people. It can be imagined that if there is no memory of the sufferings of the old China, how can we write the words "the whip of the old society will whip me, and my mother will only tear"? "Why is the battle flag picturesque? The hero's blood dyed it red; why is the earth always in spring? The hero's life is blooming!" This is an expression of respect for the revolutionary martyrs, which is a soul-stirring and lasting symphony of the times. Only artists such as Lei Zhenbang, Liu Chi, He Luting, Qiao Yu, and Gongmu who have experienced the changes of the old and new China can create lyrics and melodies that hit people's hearts. These classic works are the resonance of artists' individual experience and the emotion of the times, and are also the declaration of the times for a nation to say goodbye to suffering and move towards rebirth. From the perspective of communication, TV was not popular at that time, and film was the most popular audio-visual media. The release of a film is a group watching ceremony and also a public dissemination of mainstream ideology. The key scenes and fragments of an excellent film are often lingering in the audience's memory and even repeatedly imitated. Therefore, the music accompanying the film is easier to spread widely. Although the film music is created for the film, it can be more convenient and continuous to radiate the public without the film in a variety of scenes such as collective singing and public performance, and its influence and vitality