There are several artists by this name:
1) Magnum are a British melodic rock band from Birmingham England. Formed in 1972, Magnum have undergone several changes in personnel over the years but the singer-songwriter core of Bob Catley and Tony Clarkin remain today. Keyboard player Mark Stanway joined in 1980. Bassist from 1976 - 95 was Wally Lowe and drummers were Kex Gorin until 1984, Jim Simpson in 1985 and Mickey Barker from 1985 until the band split in December 1995.