The Book Of Souls is the band's 16th studio album since their eponymous debut in 1980 charted at #4 in the UK, in a career achieving sales of over 90 million albums worldwide. Their previous album, 2010's The Final Frontier was Maiden's most successful chart-wise to date, reaching Number One in 28 countries and was their highest chart debut in the U.S reaching #4 in the Billboard 200.