What 1969 music festival featured Jimi Hendrix and Janis Joplin?

The Woodstock Music and Art Fair was organized by four inexperienced promoters who nonetheless signed a who’s who of current rock acts, including Jimi Hendrix, Sly and the Family Stone, the Who, the Grateful Dead, Janis Joplin, the Jefferson Airplane, Ravi Shankar, and Country Joe and the Fish. The festival began to go wrong almost immediately, when the towns of both Woodstock and Wallkill, New York, denied permission to stage it. (Nevertheless, the name Woodstock was retained because of the cachet of hipness associated with the town, where Bob Dylan and several other musicians were known to live and which had been an artists’ retreat since the turn of the century.) Ultimately, farmer Max Yasgur made his land available for the festival.

Source: Britannica.com