I will cite the sources accordingly.

The arrival of vocalist Bruce Dickinson in 1981 marked a significant turning point for Iron Maiden. Dickinson's powerful, soaring vocals and charismatic stage presence helped to propel the band to new heights. The album , featuring Dickinson's debut, was a major breakthrough, reaching No. 1 in the UK charts and establishing Iron Maiden as a global force in heavy metal.

With joining in 1981, the band entered its most iconic phase, often referred to by fans as the "Holy Trinity" era.

Drummer Nicko McBrain joined the lineup, finalizing the definitive 1980s roster. The album shifted toward literary and historical themes, moving away from the darker imagery of the previous record.

A triumphant comeback album widely celebrated for its energy and songwriting.