Ritchie Blackmore. One of the greats. Him and Eric Clapton were the guys who went to Jim Marshall and got him to make the first Marshall amps. Blackmore was doing all the feedback stuff ten years before Hendrix came along. He was amazing to watch live. Some of the best concert attending memories I have. He only ever played this song live once somewhere in America but Dio used to play it when he formed Dio later on.
It got played live at the Winterland Arena in San Francisco on May 20th 1978. Isn't the internet marvellous.
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