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Rock music fans relax during a break in the entertainment at the Woodstock Music and Arts Fair in Bethel, N.Y., on Aug. 16, 1969. (AP Photo) ( WOODSTOCK )

This is a general view of the crowd at the Woodstock Music and Arts Festival, Aug. 14, 1969. (AP Photo) ( Woodstock 1969 )

This is an aerial photo of the Woodstock Music and Arts Festival held on 600 acres of cow pasture leased from a farmer at White Lake in Bethel, Sullivan County, N.Y., in Aug. 1969. The festival, billed as "Thee Days of Peace and Music," started on Friday, Aug. 15 and ended Monday morning, Aug. 18. More than 450,000 persons attended. (AP Photo/Steve Starr) ( Woodstock 1969 )

This is a view of part of the crowd at the Woodstock Music and Arts Festival held on a 600-acre pasture in the Catskill Mountains near White Lake in Bethel, N.Y., in Aug. 1969. The festival, billed as "Thee Days of Peace and Music," started on Friday, Aug. 15. More than 450,000 persons attended. (AP Photo) ( WOODSTOCK 1969 )

Jammed cars are seen on Rt. 17B near the Woodstock Festival in Bethel, N.Y., on August 16, 1969. (AP Photo) ( WOODSTOCK FESTIVAL 1969 )

A girl naps on top of her car, while trying to reach the music festival at Woodstock, N.Y., Aug. 16, 1969. (AP Photo) ( Woodstock )

Rock music fans sit on a tree sculpture as one leaps mid-air onto a pile of hay during the Woodstock Music and Art Festival held on a cow pasture at White Lake in Bethel, New York on Aug. 15, 1969. (AP Photo) ( Woodstock 1969 )

A mud-caked music lover lies atop his motorcycle at the Woodstock Music and Arts Festival, Aug. 14, 1969. (AP Photo) ( Woodstock 1969 )

Young people abandon their trucks, cars and buses as some 200,000 persons try to reach the Woodstock Music and Art Festival on a leased cow pasture at White Lake in Bethel, New York Friday, Aug. 15, 1969. Cars were backed up for 10 miles. The festival closed the New York State Thruway, creating the nation?s worst traffic jam. (AP Photo) ( Woodstock 1969 )

Music fans are treated for cuts and bruises after falling from the outside of a car on the grounds of the Woodstock Music and Arts Festival at White Lake in Bethel, N.Y., on Aug. 15, 1969. (AP Photo) ( Woodstock 1969 )

A girl helps herself to a free food ration in the camp area at the Woodstock Music Festival in Bethel, N.Y. on Aug. 15, 1969. (AP Photo) ( WOODSTOCK 1969 )

**ADVANCE FOR MONDAY AUG. 10** FILE -In this August 1969 file photo, over 400,000 people attend the Woodstock Music and Arts Festival in Bethel, N.Y., August 16, 1969. (AP Photo) ( WOODSTOCK 40th )

About 400,000 people attend the Woodstock Music and Arts Festival in Bethel, N.Y., August 16, 1969. (AP Photo) ( WOODSTOCK FESTIVAL 1969 )

A youth lies with head injuries suffered when he was thrown from the trunk of a car on the road leading to the Woodstock Music and Art festival in Bethel, New York, Aug. 16, 1969. Ambulances were unable to reach the scene because of the traffic. (AP Photo) ( Woodstock 1969 )

Concert-goers sit on the roof of a Volkswagen bus at the Woodstock Music and Arts Fair at Bethel, N.Y., in mid-August, 1969. The three-day concert attracted hundreds of thousands of people, and became a landmark cultural event of the late '60s. (AP Photo) ( WOODSTOCK 1969 )

Hundreds of rock music fans walk along the wet highway leading from Bethel, New York, Aug. 16, 1969 as they try to leave the Woodstock Music and Art Festival. Two hundred thousand persons spent a rainy night at the festival. (AP Photo) ( Woodstock 1969 )

Woodstock Rock music fans gather at a stand outside a motel near the Woodstock Music and Arts Festival in Bethel, New York, Aug. 16, 1969. (AP Photo) ( Woodstock 1969 )

Hundreds of rock music fans jam highway leading from Bethel, New York, Aug. 16, 1969 as they try to leave the Woodstock Music and Art Festival. Two hundred thousand persons spent a rainy night at the festival. (AP Photo) ( Woodstock 1969 )

Hundreds of rock music fans jam highway leading from Bethel, New York, Aug. 16, 1969 as they try to leave the Woodstock Music and Art Festival. Two hundred thousand persons spent a rainy night at the festival. (AP Photo) ( Woodstock 1969 )

Thousands of rock music fans are packed around the stage in a field near Bethel, New York at the Woodstock Festival, on August 16, 1969. A throng estimated at 500,000 persons covered on the area creating a gigantic jam of traffic and humanity over many miles and giving rise for concern for the health and safety of many of them. (AP Photo/Marty Lederhandler) ( Woodstock Festival )

About 400,000 people attend the Woodstock Music and Arts Festival in Bethel, N.Y., August 16, 1969. (AP Photo) ( WOODSTOCK FESTIVAL 1969 )

Music fans seek shelter is a grass hut at the Woodstock Music and Art Festival in Bethel, New York, Aug. 17, 1969. Sign above reads "Have a Marijuana." (AP Photo) ( Woodstock 1969 )

Woodstock Music and Art Festival participants leave the festival on Aug. 17, 1969 in Bethel, N.Y. (AP Photo) ( WOODSTOCK FESTIVAL 1969 )

An unidentified woman flashes the peace sign as she is lifted above part of the crowd gathered in front of the main stage at Woodstock '94 in Saugerties, N.Y., Aug. 13, 1994. Promoters said there were as many as 250,000 people already on the 850-acre site, with many more coming on charter buses, stuck at shuttle bus sites or straggling in on foot. (AP Photo/Robert F. Bukaty) ( Woodstock '94 )

Rock music fans hike from the Woodstock Music and Arts Festival in Bethel, N.Y., Aug. 17, 1969. Some 300,000 fans began to leave as the festival ended in the rain. (AP Photo) ( Woodstock 1969 )

Volunteers pick up trash in the mud on the grounds of the Woodstock Music and Art Festival in Bethel, New York, Aug. 17, 1969. Festival sponsors asked for volunteer help in removing the debris left by some 300,000 rock music fans. (AP Photo) ( Woodstock 1969 )

Part of the vast audience at the Woodstock Music Festival in Woodstock, New York on August 14 ,1969. (AP Photo) ( Woodstock Music Festival 1969 )

Rock music fans hike from the Woodstock Music and Art Festival in Bethel, New York, Aug. 17, 1969. Some 300,000 fans began to leave as the festival ended in the rain. (AP Photo) ( Woodstock 1969 )

Workers carry medical supplies that arrived by helicopter on the grounds of the Woodstock Music and Art Festival in Bethel, N.Y., Aug. 17, 1969. Helicopters were pressed into service when some 300,000 person attending the festival blocked all roads. (AP Photo) ( Woodstock )

Woman sweeps debris from the street in front of her home in Bethel, NY, as rock music fans leave the Woodstock Music and Art Festival, Aug. 18, 1969. Many of the 300,000 persons attending the festival were still making their way home. (AP Photo) ( Woodstock 1969 )

His fans might noT recognize him but that?s Ringo Starr of the Famed Beatles sporting a beard and cropped Hairdo. He?s shown with U.S. film director Michael Wadleigh at the presentation of the film ?Woodstock? at the Cannes Festival Palace, May 9, 1970. (AP Photo) ( Presentation of Film Woodstock )

Young people begin leaving the grounds of the Woodstock concerts after spending a rainy night, Aug. 16, 1969. (AP Photo) ( Woodstock 1969 )