Sin City - Revell and Debney making the score
John Debney and Graeme Revell both worked together with Rodriguez before. Debney and the director together for the score of the "Spy kids" movies. Revell made the score for the Vampire movie "From Dusk till Dawn".
Frank Miller wrote the graphic novel series that inspired the film. The film will comprise three intertwining vignettes revolving around a dark set of characters who call the fictional corrupt town home. The titles that the movie will loosely follow are "The Hard Good Bye" (renamed from simply 'Sin City'), "The Big Fat Kill", and "That Yellow Bastard".
Source: Movie Infos (German Partner Site)