That single-letter surname isn't the only thing obscuring Adam F's true identity. This twenty-four-year-old junglist's first great single was 1995's "Circles," a catchy clubfloor favorite that copped a riff from lite-jazz keyboardist Bob James and draped it over some vigorous beats, bringing smiles to dancers throughout London. But F's second great single was 1996's "Metropolis," a frightening...