There are so many themes in popular culture. So, you will have to be selective. Here are three themes that I believe are most prevalent.
First, one of the most common themes of popular culture is that our feelings are sacred. In our post-modern world there are few things that are authoritative. It appears only our emotions are left as the arbiter of truth.
Second, popular culture also glamorizes youth and the things associated with you, such as beauty, freedom, and spontaneity.
Finally, popular culture is anti-authority. It wants to dispense with all types of authority, such as police, parents, teachers, and anything else represents authority.