Book excerpt: A revealing investigation into the life of a reclusive cult genius. Syd Barrett was Pink Floyd's founder, singer, guitarist and principal composer, who left the group in 1968 amidst tales of acid-induced madness. Barrett's brief flash of erratic brilliance is now the stuff of rock legend, and his post-Floyd recordings have become cult classics. Revised in 2006, this book draws on years on research to relate the story of an epic rock tragedy.