The incomparable Ronnie James Dio, frontman for Elf, Rainbow, Black Sabbath, Dio, and Heaven and Hell.  Dio’s first band Elf were regular support for Deep Purple in the US and when Ritchie Blackmore left to form Rainbow he invited Ronnie to join. Rolling Stone magazine eulogized Dio with these words: “It wasn’t just his mighty pipes that made him Ronnie James Dio — it was his moral fervor…what always stood out was Dio’s raging compassion. Dio never pretended to be one of the kids — he sang as an adult assuring us that we weren’t alone in our suffering, and some day we might even be proud of conquering it.”