The next best thing to actually being there, here is a time machine.
“Woodstock: The Lost Performances”
1 hour and 8 minutes of Peace and Music.
A 1991 compilation of outtakes from the 120 or so miles of film taken at the festival
The Band, Joe Cocker, Canned Heat, Paul Butterfield, Arlo Guthrie, Blood Sweat & Tears, Country Joe McDonald, John Sebastian, Sly and the Family Stone, Tim Hardin, Melanie, Joan Baez, Crosby, Stills & Nash, Janis Joplin, and Richie Havens.
Bear with the awful 1 minute intro – the performances are great!