Remember that Girl Talk documentary about the remix culture and how MacBooks were going to change the world? By fostering, uh, the urge just to work on other people’s work rather than make your own work? Jeez. It seems likely that there won’t be any new songs or movies within thirty years. Is there a psychological description for nostalgia’s obvious economic puissance? Like, how many times do I have to hear ‘Don’t Stop Believing’ before I’m totally done with it?