"So how about John Travolta, Amanda Bynes, Christopher Walken, Queen Latifah, and Michelle Pfeiffer in a Broadway musical? How come only half of those actors are also singers?"

I'm not sure about Amanda Bynes, but I'm pretty sure all of the rest of them are singers. Yes, even Christopher Walken.

I loved the original movie "Producers" and the Broadway adaptation, but wasn't a big fan of the movie re-adaptation. Still, I have pretty high hopes for the similar "Hairspray" re-adaptation; early word has been good and (possibly qualms about Travolta aside) I like the casting overall; Queen Latifah in particular is a perfect choice.