If you're the slightest bit interested in Yes, this book will be worth reading. It's a comprehensive chronology of the band's musical history, written by rock critic Chris Welch. Chris is not only a big fan of the group, but also had extensive access to the band and individual members over the years. It's a fascinating read, but does often come over as a patchwork series of album and gig reviews, which is probably where Chris sourced much of his information. It is therefore often dry and technical, whilst missing the empathy and joviality evident in, for example, Rick Wakeman's excellent Grumpy Old Rock Star books. Still, it's an enjoyable and illuminating read, especially if you're able to listen to the appropriate music whilst reading the sections of the book relating the the music. What an amazing band. May their music last and last.