Author Gillian Gaar alerted us she's contributing two chapters to a forthcoming book, "Sgt. Pepper at Fifty: The Mood, the Look, the Sound, the Legacy of the Beatles' Great Masterpiece," due to be published next year by SterlingPublishing in the U.S. and Omnibus Press in the UK (Amazon UK link for our British readers). Also listed as authors are Bill DeMain and Mike McInnerney. We'll tell you more as the book gets closer. Gaar is the author of numerous books about music, including "100 Things Beatles Fans Should Know and Do Before They Die."