Peter Gabriel is terribly fond of a Big Idea. With Genesis he would sing in character as a lawnmower, a fox and as ‘Slipperman’. His final work with the band, in 1974, was The Lamb Lies Down on Broadway, a double album driven by what we might kindly describe as a ‘kaleidoscopic’ narrative involving a Puerto-Rican protagonist on a voyage of self-discovery in New York City.