Woodstock was a music festival held August 15–18, 1969, which attracted an audience of more than 400,000. Billed as "an Aquarian Exposition: 3 Days of Peace & Music", it was held at Max Yasgur's 600-acre dairy farm in Bethel, New York, 43 miles (70 km) southwest of Woodstock. It was alternatively referred to as the Bethel Rock Festival or the Aquarian Music Festival. Thirty-two acts performed outdoors despite sporadic rain. It has become widely regarded as a pivotal moment in popular music history, as well as the definitive nexus for the larger counterculture generation.
The event's significance was reinforced by a 1970 Academy Award–winning documentary film, an accompanying soundtrack album, and a Joni Mitchell–written song that became a major hit for both Crosby, Stills, Nash & Young and Matthews Southern Comfort.
Starting in 1979, music events bearing the Woodstock name have been planned for major anniversaries including the tenth, twentieth, twenty-fifth, thirtieth, fortieth, and fiftieth. In 2004, Rolling Stone listed it as number 19 of the 50 Moments That Changed the History of Rock and Roll. In 2017, the festival site was listed on the National Register of Historic Places.