The bookwriter of a musical is probably the greatest unsung hero of Broadway. He or she gets very little recognition when a show works, but when a show fails, the book writer is often the first to be blamed. It is perhaps a thankless task, but their work is essential to designing the framework of the story for the composer and lyricist to hang their score on. Indeed, some of the book writer's best writing is often transformed into musical moments, stealing the best of their thunder. Many books of a Broadway musical are amazingly strong and today's top-ten list is an examination of some of the best. I made my choices by the criteria of originality, intelligently designed character voice, and the book needs to follow strong storytelling structure. I know I will be maligned for leaving certain titles out and I'm glad to justify why I left them off the list. Start the debate and maybe I'll agree. Or...maybe not.