Can Progressive Rock and Heavy Metal coexist? It may be a question that vexes the purists of either genre, in modern day crossovers everything is nearly acceptable and certainly possible but in the late 1980s two bands from opposite sides of the Atlantic embarked on producing albums that embraced the concept and rich diversity that the amalgamation of two distinct entities could bring them. Queensryche’s Operation Mindcrime would come out towards the end of April in 1988, the honour though of bringing out arguably the first Progressive Metal album would belong to Britain’s Iron Maiden with their most ambitious record at the time, the sensational Seventh Son of a Seventh Son.