The improvised freedom and emotional truth is the charm of jazz, which makes every note full of life and stories. The following is a brief understanding: The life of Louis Armstrong, the father of jazz, is a microcosm of the history of jazz development and a witness to the integration of American cultural diversity. He used music as a bridge to connect different races, cultures and social classes; with art as a weapon, he challenged the prejudices and injustice of the times. As he said before his death, ”My whole life, my whole spirit, my whole heart played on that trumpet.“ Today, when we listen to his music, we can still feel the enthusiasm and hope that transcends the times - it is the soul of jazz and the eternal gift left by Armstrong to the world.