Book excerpt: Mark Blake draws on his own interviews with band members as well as the group's friends, road crew, musical contemporaries, former housemates, and university colleagues to produce a history of one of the biggest rock bands of all time. We follow Pink Floyd from the early psychedelic nights at UFO, to the stadium-rock and concept-album zenith of the seventies, to the acrimonious schisms of the late '80s and '90s.