Many of the people who work on Broadway keep scrapbooks of their experiences: photos, signed posters, ticket stubs, and, of course the Playbills. These are treasured keepsakes, something to be savored over a lifetime, and then passed on to friends and descendants. Playbill Books, a division of the iconic 125-year-old company that designs the programs for every show on Broadway, has expanded this idea into an annual book that has become a Broadway...