Iron Maiden formed in London at the end of the '70s and became one of heavy metal's reigning bands. The group's original singer, Paul Di'anno, was replaced by Bruce Dickinson in 1982, just in time for their breakthrough album 'The Number of the Beast.' Over the years, members have come and gone: Dickinson was replaced by Blaze Bayley in 1993, until his return in 1999; original guitarist Adrian Smith left for a while. Through it all, bassist Steve Harris has anchored the band through ups and downs. In addition to possessing one of the most assault catalogs of metal in the history of music, Iron Maiden have one of rock's greatest mascots in Eddie.