Magnum are a British Progressive Rock band from Birmingham, England. Formed as a four piece by Tony Clarkin (guitar), Bob Catley (vocals), Kex Gorin (drums) and Bob Doyle (bass) in order to appear as the resident band at The Rum Runner night club Birmingham. Magnum have undergone several changes in personnel over the years; however, the core of vocalist Bob Catley and guitarist/songwriter Tony Clarkin remain today.