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"extract": "California Jam was a rock music festival co-headlined by Deep Purple and Emerson, Lake \u0026 Palmer, held at the Ontario Motor Speedway in Ontario, California, on April 6, 1974. It was produced by ABC Entertainment, Sandy Feldman and Leonard Stogel. Pacific Presentations, a Los Angeles\u2013based concert company headed by Sepp Donahower and Gary Perkins, coordinated the event, booked all the musical talent and ran the advertising campaign. Don Branker worked for Leonard Stogel and was responsible for concert site facilitation, toilets, fencing and medical. The California Jam attracted 300,000 paying music fans. The festival set what were then records for the loudest amplification system ever installed, the highest paid attendance, and highest gross in history. It was one of the last of the original wave of rock festivals, as well as one of the most well-executed and financially successful, and presaged the era of media consolidation and the corporatization of the rock music industry.",
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