The podcast Serial uses various sound effects and music to set different moods and illustrate key elements of the story. Incidental music at the beginning and end is upbeat, representing Hae Min Lee's normal life before her death. When discussing sad elements like her disappearance, slow music plays. Interviews include external sounds like a gate swing. Mysterious music builds tension around suspects. The varied soundscape helps listeners understand and follow the complex true crime story. In contrast, radio uses only upbeat music and jingles to keep listeners happy during their morning commute.