I've been a fan of heavy metal for - heck most of my life. He sang on some of my favourite albums (Black Sabbath's Heaven and Hell and Dio's Holy Diver spring to mind).
I just read of his death from cancer on the BBC News website and I'm saddened. Okay as a heavy metal singer maybe other people had more of an effect on the world but his music made me happy - and I'm sure many others.
It's a sad day.