“On July 3, 1969, two days before the Rolling Stones were to headline a free music festival in Hyde Park, their former guitarist Brian Jones drowned in his swimming pool. What was supposed to have been a party became, instead, a memorial.
About half a million people saw the Stones perform, including Mick Jagger’s girlfriend at the time, Marianne Faithfull. Before they played, Jagger read out Shelley’s poem Adonais, and 3,500 white butterflies were released. …”