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Some of the crowd at The Valley, Charlton Athletic's football ground, for the Summer of '74 one-day rock festival, London, 18th May 1974. The Who topped the bill, with other performances from Humble Pie, Lou Reed, Bad Company, Lindisfarne, Maggie Bell and Montrose. (Photo by Michael Putland/Getty Images)

Some of the crowd at The Valley, Charlton Athletic's football ground, for the Summer of '74 one-day rock festival, London, 18th May 1974. The Who topped the bill, with other performances from Humble Pie, Lou Reed, Bad Company, Lindisfarne, Maggie Bell and Montrose. (Photo by Michael Putland/Getty Images)