When The Who went to the Monterey Pop Festival, they innovated the live performance by channelling aggression, playing at high volume and destroying their instruments. This established the festival as the centre of the rock performance but also signalled the end of the innocent optimism of the summer of love. Anxieties over the Vietnam war and social unrest rising and, after the Woodstock Festival, business started to take over what artists were doing. This new mood was channelled by the Rolling Stones using darkness as a new creative zeal. However, they were plunged into their own darkness with the death of Brian Jones and the chaos of Altamont, where, according to Al Kooper, the innocence of the Sixties finally died.