Carlos Santana, Jefferson Airplane, the Flying Burrito Brothers and Crosby, Stills, Nash & Young also appear in 26 minutes of home video at event that marked end of hippy dream

Twenty-six minutes of unseen footage of the vast and notoriously violent Altamont music festival held in northern California in 1969 have been unexpectedly uncovered.

The home-movie footage – which is vividly shot on 8mm film, but frustratingly silent – has been published by the Library of Congress on its website.