Iron Maiden formed in Leyton, East London, in 1975 by bassist and primary songwriter Steve Harris. The band experienced frequent lineup changes in its early years, with Harris as the sole constant member. By 1979, they secured a deal with EMI after their 'Soundhouse Tapes' demo, releasing their self-titled debut album in 1980 featuring vocalist Paul Di'Anno, guitarist Dave Murray, and drummer Clive Burr. The classic lineup solidified in the 1980s with Bruce Dickinson on vocals, Nicko McBrain on drums, and guitarists Dave Murray, Adrian Smith, and later Janick Gers. Associated with the New Wave of British Heavy Metal, Iron Maiden's style features galloping rhythms, twin-lead guitars, and operatic vocals. Notable albums include 'The Number of the Beast' (1982), 'Powerslave' (1984), and 'Seventh Son of a Seventh Son' (1988). They have released 17 studio albums as of 2021. The band is known for elaborate live productions, including Eddie the mascot, pyrotechnics, and extended sets exceeding two hours, supporting decades of international touring.