The defense does not require a soundtrack. According to the query of relevant information, the volume at the defense scene is uncontrollable, and it seems redundant to have music during the defense. Therefore, the defense does not need to have a soundtrack. Defense is an educational term. Generally, several teachers from related majors ask some questions based on the students' design entities and papers, and at the same time listen to the students' personal explanations to understand the authenticity of the students' graduation projects and their familiarity with the design. Examine students' adaptability and breadth of knowledge. Listen to students’ understanding of the development prospects of the topic.