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In page Brian Jones:

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On 5 July 1969, which was only two days after Jones's death, the Rolling Stones had been scheduled to perform a free concert in Hyde Park. The concert had originally been promoted weeks earlier as the first public appearance of Mick Taylor as the band's new guitarist. The band decided instead to dedicate their upcoming Hyde Park performance to the memory of Jones. At the beginning of the concert, Jagger took the stage to read excerpts from "Adonais", a poem by Percy Bysshe Shelley about the death of his friend John Keats. Stagehands then released hundreds of white butterflies from the stage area as a tribute to Jones. Afterwards, the band played a Johnny Winter song that was one of Jones's favourites, "I'm Yours and I'm Hers", with Taylor on slide guitar.[citation needed]