I've been thinking about this, and I agree with BroadwayGirl actually - we're all writing this from, as she put it, "inside the musical theater bubble." Most of my students wouldn't know the Phantom's mask from a barricade if it hit them in the face. Unless they're involved in theater, many of them wouldn't know Annie or Grease either. I've had an amazing amount of students who didn't even know The Wizard of Oz.
Amazingly, what the majority seem to have heard of, is Hairspray and Sweeney Todd because of the movies. But if you go away from middle class New Jersey to other parts of the country, I'd bet there are as many, if not more, people who couldn't name a SINGLE musical let alone one they all would know.
Hell, I saw a statistic once that only like 87% of people could name the vice-president. What chance would we have that those people would know Phantom or Grease or Annie?
Then again, I think of it this way. I have less than no interest in NASCAR. I couldn't name a single driver -- but there are millions who could list off a hundred names without blinking, just like we could with shows. If we're REALLY talking EVERYONE in the world, I'm afraid there would be more people who know NOTHING than any one show.
Hi, Shirley Temple Pudding.