European pop culture is actually a few years behind American. When we did Game On!, it was made specifically for European cultural sensibilities. What this means is that if an American watches it, it seems hopelessly out of date. As in "Hannah Montana is relevant" out of date.
I don't think that pop culture is something that advances linearly. Like you could look at some song and say that this is 50 years behind another song. Pop culture changes as time goes on, that is true and the differences between Europe and North America are caused by the differences in the countries and their cultures and the local musicians do affect each other which causes variations in their circles as styles become popular or other influences are taken from others.
But saying that Europe is behind America sounds like we are using steam engines while you guys have nuclear power. Which is frankly insulting because I don't think that wether the kids listen to Scooter or Hannah Montana makes either group more or less advanced.
(And for the record, maybe Miss Montana hadn't gained pupolarity in Europe as quickly as she had in USA? Maybe some artists gain popularity in other countries later and if they seem "old news" in their homeland that is irrevelant since the music might be "new" to the people in other countries.)