 This is the first album with future Iron Maiden-frontman Bruce Dickinson on vocal duties, although some later re-issues of the debut do feature alternative bonus versions of songs, re-done with Dickinson vocals.The instrumental "Thunderburst" is credited as co-written by Steve Harris.The track is in fact a version of "The Ides of March", an early Iron Maiden song written during the brief time in 1977 in which Thunderstick was in Iron Maiden.