On July 5, 1969, before Woodstock and the summer of love, the Rolling Stones played to over 250,000 people in Hyde Park, for free, with a collection of other bands, in an event which helped to define UK youth culture in the late 1960s. The festival was an important one for the Stones. They had not performed a public concert since their 1967 European Tour, and in 1968 had only performed at the NME Poll Winners Concert. However, the growing estrangement of founding member Brian Jones, along…