The document provides an overview of the main characters in a new musical called "Costello Music" set in a burlesque club in Scotland run by the Fratelli brothers - Frank, Vince, and Greg. It summarizes each of the four main characters: Henrietta, the new innocent girl; Frank, the charismatic owner who falls for Chelsea; Vince, the loveable stoner brother; and Greg, the insecure youngest brother who becomes a teenage father. The musical will focus on subplots for each brother and Henrietta.