Billy Dunne is a fictional character from the novel "Daisy Jones & The Six" by Taylor Jenkins Reid. He is the lead singer and guitarist of the rock band, known for his complex personality and struggles with fame, addiction, and relationships. His character is central to the story, which is told in an interview format, revealing his journey through the music industry in the 1970s. Throughout the novel, Billy's interactions with other band members, especially Daisy Jones, highlight themes of love, ambition, and the challenges of creative collaboration. His character embodies the highs and lows of rock stardom, making him a compelling figure in the narrative.