The protagonist of the novel, an American band, died of cancer. This was a relatively common plot. In the real world, cancer was a highly contagious disease. If the band leader had cancer, the entire band could be infected. Therefore, this situation was described in the novel as a possibility that could make the story more lively and interesting. In the novel, if the band leader got cancer and eventually passed away, the band members might experience a period of deep thought and loss. They might re-examine their own lives and the future of the band, or they might miss the glory and contribution of their captain, but at the same time, they might feel pain and sadness. This kind of plot could make the novel more touching and profound, allowing the readers to better experience the emotional content of the story.