bellyache by Billie Eilish delves into themes of guilt and remorse through the narrative of a character who has committed a crime. Written alongside her brother Finneas OConnell, the song uses fiction to convey deep emotions, creating a compelling story that matches the songs dark, captivating mood. Released as part of the EP dont smile at me, bellyache stands out as one of the tracks that helped establish Billie Eilish as a distinct presence in ... See more [+] the music industry.