The Woodstock Music Festival opens with 500,000 rock music fans going to this Peace and Harmony Music Festival the groups who performed includes some of the greatest performers of late 60s pop music . Day 1 Richie Havens, Swami Satchidnanda, Country Joe McDonald, John B. Sebastion, Sweetwater, Incredible String Band, Bert Somner, Tim Hardin, Ravi Shanker, Melanie, Arlo Guthrie, Joan Biaz Day 2 Quill, Keef Hartley Band, Santana, Canned Heat, Grateful Dead, Mountain, Credence Clearwater Revival, Sly & The Family Stone, Janis Joplin, The Who. Day 3 Jefferson Airplane, Joe Cocker, Country Joe & The Fish, Ten Years After, The Band, Day 4Blood Sweat and Tears, Johny Winter, Crosby, Stills, Nash & Young, Paul Butterfield Blues Band, Sha-Na-Na, Jimi Hendrix. How many chances are there to see this type of talent assembled in one place playing live music.