Pioneers of the new wave of British heavy metal, Iron Maiden achieved initial success during the early 1980s. After several line-up changes, the band went on to release a series of UK and US platinum and gold albums, including 1982's "The Number of the Beast", 1983's "Piece of Mind", 1984's "Powerslave", 1985's live release "Live After Death", 1986's "Somewhere in Time", 1988's "Seventh Son of a Seventh Son", 1990's "No Prayer for the Dying", and 1992's "Fear of the Dark". Since the return of lead vocalist Bruce Dickinson and guitarist Adrian Smith in 1999, the band has undergone a resurgence in popularity, with a series of new albums and tours. Their 2010 studio offering, "The Final Frontier", peaked at No. 1 in 28 countries and received widespread critical acclaim. The sixteenth studio album, "The Book of Souls", was released on 4 September 2015 to similar success, topping the charts in 24 countries.