The listing, GUN with occasional MUSIC has ended.
Starting from the beginning, Gun, with Occasional Music is ostensibly a detective story in the traditional of Raymond Chandler. Lethem's Los Angeles is filled with the products of evolution therapy-- animals that walk on two legs and mostly fill the menial roles (akin to Cordwainer Smith's Instrumentality of Mankind) and babyheads, children that have been treated to have adult mental abilities while their bodies still are those of their age. Drugs are legal, available from corner "makers", who can mix your preferred blend like today's tobacconist, from substances called Avoidol, Relaxol, Acceptol, Believol, and, especially, Addictol. People carry around "karma" cards, that contain a collection of points, earned by doing good deeds, and subtracted from when caught in a crime including being rude. Instead of CNN, there's the music news, where one tries to understand if something bad has occurred based on the amount of bassoons or bass in the orchestra. Newspapers are collections of uncaptioned pictures. And people, unless police or licensed private investigators, find it the ultimate in rudeness to ask or be asked a question. Conrad Metcalf may sound like Sam Spade, but the world in which he tries to exist is not conducive to his anti-establishment position.