A wide-angle view of the huge crowd facing the distant stage during the Woodstock Music & Art Fair in August 1969 #

Young people on the road arrive at the Woodstock Music Festival on August 16, 1969. #

A group of people step over a torn-down fence in order to enter the Woodstock grounds in August 1969. #

A red six-wheeler drives down the side of a dirt road to the camping area. #

A woman named Psylvia dances in the midst of the crowd. #

A man sits atop a treehouse-like platform playing the guitar, during Woodstock. #

Young men and women skinny-dip in a river during Woodstock. #

Audience members watch a performance at the Woodstock Music & Art Fair. #

The crowd looks toward the stage during a performance by the band Santana. #

The musician Carlos Santana (right) and the bassist David Brown perform with the other members of Santana at Woodstock on August 16, 1969. #

A sound man stands on scaffolding with his equipment in front of the Woodstock crowd. #

An unidentified woman smiles while her pet monkey sits in the middle of her group. #

John Sebastian performs at the Woodstock Music & Art Fair in August 1969. #

A bedraggled young woman stands in the mud on the grounds of the Woodstock Music & Art Fair. #

Rock-music fans sit on a tree sculpture as one leaps midair onto a pile of hay during Woodstock on August 15, 1969. #

A naked couple embraces as a river rushes around them while at Woodstock. #

An unidentified shirtless man sleeps stretched across the trunks of two parked cars at the Woodstock Music & Art Fair. #

A man and a child walk past people in sleeping bags in August 1969. #

Ken Babbs, one of the Merry Pranksters, talks with a filmmaker at Woodstock's Free Stage. #

The musician Richie Havens performs onstage at the Woodstock Music & Art Fair on August 15, 1969. #

A long-exposure photo of the huge nighttime crowd #

The stage is lit up during a performance at the Woodstock Music & Art Fair. #

The Indian musicians Ravi Shankar and Alla Rakha (left) perform onstage on August 15, 1969. #

Several young people dish out food to others in a food line, during the Woodstock Music & Art Fair. #

Halsey Clifton (right) stands on the sound-mixing table in the rain with a huge crowd around. #

A woman runs through the mud at Woodstock on August 17, 1969. #

A view from the back of the stage as the rock group Country Joe and the Fish perform in the rain on August 17, 1969. #

Attendees mill about the grounds of the Woodstock Music & Art Fair. #

Max and Miriam Yasgur, photographed in front of the trash remaining on their dairy farm, after the Woodstock Music & Art Fair. #