For a time, the Isle of Wight Festivals transformed a sleepy English island into the rock'n'roll capital of the world. What started in 1968 as a parochial one-nighter in a stubble field to raise funds for a local swimming pool, a year later ballooned into a massive outdoor gathering. Numbers skyrocketed as devotees flocked to the Island from mainland Britain, Europe, the Americas and as far away as Australia, to pay homage to rock's poet laureate,...