Their third studio release The Number of the Beast just celebrated its 30th anniversary on March 22nd. The 1982 album went Platinum in a number of countries and charted quite well (number 1 in the UK, number 11 in Canada, and number 33 on the US Billboard Hot 200). It also marked two turning points in the band: it was the final appearance of drummer Clive Burr with the band, and it was the debut of singer Bruce Dickinson.
