Woodstock '69 :

Monterey festival, festival of the Isle of Wight Festival Woodstock: as many meetings with larger groups of the time ... a guitar in hand, the acoustic "Folk Singers" or electric for "Guitar Heroes".

Woodstock is the largest pop festival or a gathering of more than 500,000 people took place without incident.
A huge mass, celebrated during 3 days of love, nonviolence and respect for others.
The benefits of Jimi Hendrix, Creedence's, the Who, Joe Coocker remain etched in our collective memory and their "positive vibrations" are still here among us.