Playbill is simply a magazine that productions use and insert their program information into it. It's fascinating that the value of having the trademark yellow logo at the top of the cover is simply sentimental/historic. Without it, a production seems less "official."
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle