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California Jam 1974 - The Day Rock Became an Empire

Ontario Motor Speedway, California. April 6, 1974. On a massive open field built for speed, rock music turned into something even bigger than a concert. California Jam was held at Ontario Motor Speedway in Ontario, California — a one-day festival that gathered hundreds of thousands of people under the heat, dust, scaffolding, speaker towers, and television cameras of 1970s rock culture.