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August 1969: A group of friends sitting by their car at the Woodstock Music and Arts Fair, one of them is giving a peace sign. (Photo by Three Lions/Getty Images)

August 1969:  A group of friends sitting by their car at the Woodstock Music and Arts Fair, one of them is giving a peace sign.  (Photo by Three Lions/Getty Images)

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Festival-goers abandon their vehicles in a traffic jam on the way to the Woodstock Music Festival, Bethel, New York, 15th August 1969. At centre is a bus painted with the words 'Freak Out'. (Photo by Archive Photos/Getty Images)

Festival-goers abandon their vehicles in a traffic jam on the way to the Woodstock Music Festival, Bethel, New York, 15th August 1969. At centre is a bus painted with the words 'Freak Out'. (Photo by Archive Photos/Getty Images)

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A young man arriving at Bethel, New York, for the Woodstock Music Festival, 15th-17th August 1969. (Photo by Pictorial Parade/Hulton Archive/Getty Images)

A young man arriving at Bethel, New York, for the Woodstock Music Festival, 15th-17th August 1969. (Photo by Pictorial Parade/Hulton Archive/Getty Images)

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August 1969: Two young men in the boot of a car after hitching a lift home from the Woodstock Music and Arts Fair. (Photo by Three Lions/Getty Images)

August 1969:  Two young men in the boot of a car after hitching a lift home from the  Woodstock Music and Arts Fair.  (Photo by Three Lions/Getty Images)

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A naked man in the crowd at the Woodstock Music Festival, Bethel, New York, 15th-17th August 1969. (Photo by Pictorial Parade/Hulton Archive/Getty Images)

A naked man in the crowd at the Woodstock Music Festival, Bethel, New York, 15th-17th August 1969. (Photo by Pictorial Parade/Hulton Archive/Getty Images)