The Number of the Beast topped the charts in the U.K., but even more crucially -- with Judas Priest having moved into more commercial territory -- it also made Iron Maiden the band of choice for purists who wanted their metal uncompromised. Maiden took the basic blueprint Priest had created in the late '70s -- aggressive tempos, twin-guitar interplay, wide-ranging power vocals -- and cranked everything up faster and louder. The album's intensity never lets up, the musical technique is peerless for its time, and there isn't a truly unmemorable song in the bunch. Blessed with a singer who could drive home a melody in grandiose fashion, Steve Harris' writing gets more ambitious, largely abandoning the street violence of old in favor of fittingly epic themes drawn from history, science fiction, and horror. The exceptions are "22 Acacia Avenue," a sequel to "Charlotte the Harlot" that sounds written for Di'Anno's range, and the street-crime tale "Gangland," which Harris didn't write; though the punk influences largely left with Di'Anno, these two definitely recall the Maiden of old. As for the new, two of the band's (and, for that matter, heavy metal's) all-time signature songs are here. The anthemic "Run to the Hills" dramatized the conquest of the Native Americans and became the band's first Top Ten U.K.