[chesser]

I don't think an AI Justin Bieber is that far off.

AIs can create pop music in your virtual world if you like that sort of thing. All the other AIs will be talking about it, so you won't need some central source of anything in order to have common ground with people in your reality.

It will be fine if random permutations lead to people in your virtual reality listening to "Yeah, Girl" instead of "Girl, Yeah" or "All Right Girl".

Movies won't be very important when you can interactively experience anything you want. Climb K2 but without the risk of permanent death. Movies will just be a Machinima subset of the interactive simulation if you still want them.