The Blizzard of Ozz and Diary of a Madman albums, along with the live Mr Crowley EP were game changers in the world of heavy rock. Here was a wee genius, steeped in classical guitar knowledge carving amazing sounds out of his guitar; sounds that no-one had heard before. I€™m sure you, like me, sat up on hearing Crazy Train and said €œwho the hell is that? He€™s a genius.€? And we still feel like that today.