John Murphy is a British film composer. He is a self-taught multi-instrumental musician who began his career in the 1980s, working with The Lotus Eaters, Thomas Lang, and Claudia Brücken. He has collaborated with directors Danny Boyle, Guy Ritchie, Michael Mann, Matthew Vaughn, Stephen Frears, and James Gunn.

Lock, Stock and Two Smoking Barrels is a 1998 black comedy crime film written and directed by Guy Ritchie. It follows a heist involving a confident young card sharp who loses £500,000 to a powerful crime lord in a rigged game of three-card brag, prompting him to pay off his debts by enlisting his friends to help him rob a small-time gang operating out of the apartment next door. It stars an ensemble cast featuring Jason Flemyng, Dexter Fletcher, Nick Moran, Jason Statham, Steven Mackintosh, Vinnie Jones, and Sting.