The brainchild of former Deep Purple guitarist Ritchie Blackmore, Rainbow quickly developed into one of the '70s most successful heavy metal bands behind charismatic front man Ronnie James Dio. Together, the duo would produce a string of acclaimed albums which are still considered classics of the genre. But the group would change their musical approach numerous times following the singer's departure, eventually confusing and alienating much of their audience. Releasing eight albums during it's decade long run, the band finally came to an end when Blackmore departed to rejoin his old Deep Purple comrades in a full-fledged reunion in 1984. And while the impact of Rainbow's influence has faded with the intervening decades, theirs was a crucial chapter in the development of heavy metal and hard rock.