Q. I need info on Rap Music influence on Teens

A good source for this type of information is our Controversial Issues databases. The link for these databases is below. I would recommend  EBSCO: Academic Search Complete. 

The search terms: Rap music teens  did not provide very many articles. This is a time when you just need to consider different words that may mean the same or similar things.  Adolescents, instead of teens. Use the singular form of the word - teen or adolescent.  Rap music culture may find materials on a broader topic that contains information helpful to you.

Know your topic and experiment with different possible ways to describe it.